Rewrite template in mustache and use whisker

Also allow NULL or NA for template arguments but change default to NULL

DESCRIPTION

     purrr,
     tibble,
     glue,
-    stringr
+    stringr,
+    whisker
 VignetteBuilder: knitr

R/duo.R

 #' @param text_bold_color Bold Text Color. Defaults to `secondary_color`. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to `text_color`. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to `secondary_color`. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to `secondary_color`. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to `primary_color`. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `primary_color`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `secondary_color`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `primary_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to `apply_alpha(secondary_color, 0.6)`. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = secondary_color,
   text_slide_number_color = text_color,
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = secondary_color,
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = secondary_color,
   inverse_text_color = primary_color,
   inverse_header_color = primary_color,
   title_slide_text_color = secondary_color,
   title_slide_background_color = primary_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(secondary_color, 0.6),

R/duo_accent.R

 #' @param text_bold_color Bold Text Color. Defaults to `choose_dark_or_light(secondary_color, primary_color, secondary_color)`. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to `primary_color`. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to `choose_dark_or_light(secondary_color, primary_color, secondary_color)`. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to `secondary_color`. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to `choose_dark_or_light(secondary_color, black_color, white_color)`. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `choose_dark_or_light(secondary_color, black_color, white_color)`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `choose_dark_or_light(primary_color, black_color, white_color)`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `primary_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to `apply_alpha(primary_color, 0.6)`. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = choose_dark_or_light(secondary_color, primary_color, secondary_color),
   text_slide_number_color = primary_color,
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = choose_dark_or_light(secondary_color, primary_color, secondary_color),
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = secondary_color,
   inverse_text_color = choose_dark_or_light(secondary_color, black_color, white_color),
   inverse_header_color = choose_dark_or_light(secondary_color, black_color, white_color),
   title_slide_text_color = choose_dark_or_light(primary_color, black_color, white_color),
   title_slide_background_color = primary_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(primary_color, 0.6),

R/duo_accent_inverse.R

 #' @param text_bold_color Bold Text Color. Defaults to `choose_dark_or_light(secondary_color, secondary_color, primary_color)`. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to `primary_color`. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to `choose_dark_or_light(secondary_color, secondary_color, primary_color)`. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to `secondary_color`. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to `choose_dark_or_light(secondary_color, black_color, white_color)`. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `choose_dark_or_light(secondary_color, black_color, white_color)`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `choose_dark_or_light(primary_color, black_color, white_color)`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `primary_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to `apply_alpha(primary_color, 0.6)`. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = choose_dark_or_light(secondary_color, secondary_color, primary_color),
   text_slide_number_color = primary_color,
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = choose_dark_or_light(secondary_color, secondary_color, primary_color),
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = secondary_color,
   inverse_text_color = choose_dark_or_light(secondary_color, black_color, white_color),
   inverse_header_color = choose_dark_or_light(secondary_color, black_color, white_color),
   title_slide_text_color = choose_dark_or_light(primary_color, black_color, white_color),
   title_slide_background_color = primary_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(primary_color, 0.6),

R/mono_accent.R

 #' @param text_bold_color Bold Text Color. Defaults to `base_color`. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to `base_color`. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to `base_color`. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to `base_color`. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to `white_color`. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `white_color`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `inverse_text_color`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `inverse_background_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to `apply_alpha(base_color, 0.6)`. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = base_color,
   text_slide_number_color = base_color,
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = base_color,
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = base_color,
   inverse_text_color = white_color,
   inverse_header_color = white_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(base_color, 0.6),

R/mono_accent_inverse.R

 #' @param text_bold_color Bold Text Color. Defaults to `base_color`. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to `base_color`. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to `base_color`. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to `base_color`. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to `black_color`. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `black_color`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `inverse_text_color`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `inverse_background_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to `apply_alpha(base_color, 0.6)`. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = base_color,
   text_slide_number_color = base_color,
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = base_color,
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = base_color,
   inverse_text_color = black_color,
   inverse_header_color = black_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(base_color, 0.6),

R/mono_dark.R

 #' @param text_bold_color Bold Text Color. Defaults to `base_color`. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to `base_color`. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to `base_color`. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to `base_color`. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to `black_color`. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `black_color`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `inverse_text_color`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `inverse_background_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to `apply_alpha(base_color, 0.6)`. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = base_color,
   text_slide_number_color = base_color,
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = base_color,
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = base_color,
   inverse_text_color = black_color,
   inverse_header_color = black_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(base_color, 0.6),

R/mono_light.R

 #' @param text_bold_color Bold Text Color. Defaults to `base_color`. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to `base_color`. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to `base_color`. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to `base_color`. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to `white_color`. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `white_color`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `inverse_text_color`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `inverse_background_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to `apply_alpha(base_color, 0.6)`. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = base_color,
   text_slide_number_color = base_color,
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = base_color,
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = base_color,
   inverse_text_color = white_color,
   inverse_header_color = white_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(base_color, 0.6),

R/solarized_dark.R

 #' @param text_bold_color Bold Text Color. Defaults to #d33682. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to #586e75. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to #268bd240. Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to #6c71c4. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to #fdf6e3. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to #002b36. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `inverse_text_color`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `inverse_text_color`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `inverse_background_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to #586e75. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = "#d33682",
   text_slide_number_color = "#586e75",
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "#268bd240",
   code_inline_color = "#6c71c4",
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = "#fdf6e3",
   inverse_text_color = "#002b36",
   inverse_header_color = inverse_text_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = "#586e75",

R/solarized_light.R

 #' @param text_bold_color Bold Text Color. Defaults to #d33682. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to #93a1a1. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to #268bd240. Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to #6c71c4. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to #002b36. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to #fdf6e3. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to `inverse_text_color`. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `inverse_text_color`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `inverse_background_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to #93a1a1. Modifies the `.left-column h2, .left-column h3` classes.
   text_bold_color = "#d33682",
   text_slide_number_color = "#93a1a1",
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "#268bd240",
   code_inline_color = "#6c71c4",
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = "#002b36",
   inverse_text_color = "#fdf6e3",
   inverse_header_color = inverse_text_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = "#93a1a1",

R/theme_settings.R

   , "header_color", "#000", "h1, h2, h3", "Header Color"
   , "background_color", "#FFF", ".remark-slide-content", "Slide Background Color"
   , "link_color", "rgb(249, 38, 114)", "a, a > code", "Link Color"
-  , "text_bold_color", NA_character_, "strong", "Bold Text Color"
+  , "text_bold_color", NULL, "strong", "Bold Text Color"
   , "text_slide_number_color", "{inverse_background_color}", ".remark-slide-number", "Slide Number Color"
   , "padding", "1em 4em 1em 4em", ".remark-slide-content", "Slide Padding in `top right [bottom left]` format"
-  , "background_image", NA_character_, ".remark-slide-content", "Background image applied to each *and every* slide. Set `title_slide_background_image = \"none\"` to remove the background image from the title slide."
-  , "background_size", NA_character_, ".remark-slide-content", "Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent."
-  , "background_position", NA_character_, ".remark-slide-content", "Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`."
+  , "background_image", NULL, ".remark-slide-content", "Background image applied to each *and every* slide. Set `title_slide_background_image = \"none\"` to remove the background image from the title slide."
+  , "background_size", NULL, ".remark-slide-content", "Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent."
+  , "background_position", NULL, ".remark-slide-content", "Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`."
   , "code_highlight_color", "rgba(255,255,0,0.5)", ".remark-code-line-highlighted", "Code Line Highlight"
   , "code_inline_color", "#000", ".remark-inline-code", "Inline Code Color"
-  , "code_inline_background_color", NA_character_, ".remark-inline-code", "Inline Code Background Color"
+  , "code_inline_background_color", NULL, ".remark-inline-code", "Inline Code Background Color"
   , "code_inline_font_size", "1em", ".remark-inline-code", "Inline Code Text Font Size"
   , "inverse_background_color", "#272822", ".inverse", "Inverse Background Color"
   , "inverse_text_color", "#d6d6d6", ".inverse", "Inverse Text Color"
   , "inverse_header_color", "#f3f3f3", ".inverse h1, .inverse h2, .inverse h3", "Inverse Header Color"
   , "title_slide_text_color", "{inverse_text_color}", ".title-slide", "Title Slide Text Color"
   , "title_slide_background_color", "{inverse_background_color}", ".title-slide", "Title Slide Background Color"
-  , "title_slide_background_image", NA_character_, ".title-slide", "Title Slide Background Image URL"
-  , "title_slide_background_size", NA_character_, ".title-slide", "Title Slide Background Image Size, defaults to \"cover\" if background image is set"
-  , "title_slide_background_position", NA_character_, ".title-slide", "Title Slide Background Image Position"
-  , "footnote_color", NA_character_, ".footnote", "Footnote text color (if `NA`, then it will be the same color as `text_color`)"
+  , "title_slide_background_image", NULL, ".title-slide", "Title Slide Background Image URL"
+  , "title_slide_background_size", NULL, ".title-slide", "Title Slide Background Image Size, defaults to \"cover\" if background image is set"
+  , "title_slide_background_position", NULL, ".title-slide", "Title Slide Background Image Position"
+  , "footnote_color", NULL, ".footnote", "Footnote text color (if `NA`, then it will be the same color as `text_color`)"
   , "footnote_font_size", "0.9em", ".footnote", "Footnote font size"
   , "footnote_position_bottom", "3em", ".footnote", "Footnote location from bottom of screen"
   , "left_column_subtle_color", "#777", ".left-column h2, .left-column h3", "Left Column Text (not last)"

R/utils.R

 `%||%` <- function(x, y) if (is.null(x)) y else x
 
+`%??%` <- function(x, y) if (!is.null(x)) y else NULL
+
 #' @title Generate lighter or darker version of a color
 #' @description Produces a linear blend of the color with white or black.
 #' @param color_hex A character string representing a hex color

R/write_theme.R

 #' @param header_color Header Color. Defaults to #000. Modifies the `h1, h2, h3` elements.
 #' @param background_color Slide Background Color. Defaults to #FFF. Modifies the `.remark-slide-content` class.
 #' @param link_color Link Color. Defaults to rgb(249, 38, 114). Modifies the `a, a > code` elements.
-#' @param text_bold_color Bold Text Color. Defaults to NA. Modifies the `strong` element.
+#' @param text_bold_color Bold Text Color. Defaults to `NULL`. Modifies the `strong` element.
 #' @param text_slide_number_color Slide Number Color. Defaults to `inverse_background_color`. Modifies the `.remark-slide-number` class.
 #' @param padding Slide Padding in `top right [bottom left]` format. Defaults to 1em 4em 1em 4em. Modifies the `.remark-slide-content` class.
-#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to NA. Modifies the `.remark-slide-content` class.
-#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to NA. Modifies the `.remark-slide-content` class.
+#' @param background_image Background image applied to each *and every* slide. Set `title_slide_background_image = "none"` to remove the background image from the title slide.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_size Background image size, requires `background_image` to be set. If `background_image` is set, `background_size` will default to `cover` so the backround fills the screen. If both `background_image` and `background_position` are set, will default to 100 percent.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
+#' @param background_position Background image position, requires `background_image` to be set, and it is recommended to adjust `background_size`.. Defaults to `NULL`. Modifies the `.remark-slide-content` class.
 #' @param code_highlight_color Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the `.remark-code-line-highlighted` class.
 #' @param code_inline_color Inline Code Color. Defaults to #000. Modifies the `.remark-inline-code` class.
-#' @param code_inline_background_color Inline Code Background Color. Defaults to NA. Modifies the `.remark-inline-code` class.
+#' @param code_inline_background_color Inline Code Background Color. Defaults to `NULL`. Modifies the `.remark-inline-code` class.
 #' @param code_inline_font_size Inline Code Text Font Size. Defaults to 1em. Modifies the `.remark-inline-code` class.
 #' @param inverse_background_color Inverse Background Color. Defaults to #272822. Modifies the `.inverse` class.
 #' @param inverse_text_color Inverse Text Color. Defaults to #d6d6d6. Modifies the `.inverse` class.
 #' @param inverse_header_color Inverse Header Color. Defaults to #f3f3f3. Modifies the `.inverse h1, .inverse h2, .inverse h3` classes.
 #' @param title_slide_text_color Title Slide Text Color. Defaults to `inverse_text_color`. Modifies the `.title-slide` class.
 #' @param title_slide_background_color Title Slide Background Color. Defaults to `inverse_background_color`. Modifies the `.title-slide` class.
-#' @param title_slide_background_image Title Slide Background Image URL. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the `.title-slide` class.
-#' @param title_slide_background_position Title Slide Background Image Position. Defaults to NA. Modifies the `.title-slide` class.
-#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to NA. Modifies the `.footnote` class.
+#' @param title_slide_background_image Title Slide Background Image URL. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_size Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param title_slide_background_position Title Slide Background Image Position. Defaults to `NULL`. Modifies the `.title-slide` class.
+#' @param footnote_color Footnote text color (if `NA`, then it will be the same color as `text_color`). Defaults to `NULL`. Modifies the `.footnote` class.
 #' @param footnote_font_size Footnote font size. Defaults to 0.9em. Modifies the `.footnote` class.
 #' @param footnote_position_bottom Footnote location from bottom of screen. Defaults to 3em. Modifies the `.footnote` class.
 #' @param left_column_subtle_color Left Column Text (not last). Defaults to #777. Modifies the `.left-column h2, .left-column h3` classes.
   header_color = "#000",
   background_color = "#FFF",
   link_color = "rgb(249, 38, 114)",
-  text_bold_color = NA,
+  text_bold_color = NULL,
   text_slide_number_color = inverse_background_color,
   padding = "1em 4em 1em 4em",
-  background_image = NA,
-  background_size = NA,
-  background_position = NA,
+  background_image = NULL,
+  background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = "#000",
-  code_inline_background_color = NA,
+  code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = "#272822",
   inverse_text_color = "#d6d6d6",
   inverse_header_color = "#f3f3f3",
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA,
-  title_slide_background_size = NA,
-  title_slide_background_position = NA,
-  footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL,
+  footnote_color = NULL,
   footnote_font_size = "0.9em",
   footnote_position_bottom = "3em",
   left_column_subtle_color = "#777",
     }
   }
   
-  # Handle background-image defaults
-  if (!is.na(background_image)) {
-    if (is.na(background_size)) background_size <- ifelse(
-      is.na(background_position),
-      "cover",
-      "100%"
-    )
+  extra_font_imports <- if (is.null(extra_fonts)) "" else list2fonts(extra_fonts)
+  
+  # convert NA arguments to NULL
+  for (var in f_args) {
+    val <- eval(parse(text = var))
+    if (is.null(val)) next
+    is_na <- is.na(val)
+    if (is_na) assign(var, NULL)
   }
   
-  extra_font_imports <- if (is.null(extra_fonts)) "" else list2fonts(extra_fonts)
+  # prepare variables for template
+  backround_size_fallback <- if (is.null(background_position)) "cover" else "100%"
+  background_size <- background_image %??% (background_size %||% background_size_fallback)
+  title_slide_background_size <- title_slide_background_size %||% (
+    title_slide_background_image %??% "cover"
+  )
+  table_row_even_background_color <- table_row_even_background_color %||% background_color
   
   tf <- system.file("resources", "template.css", package = "xaringanthemer")
   template <- readLines(tf, warn = FALSE)
   template <- paste(template, collapse = "\n")
-  x <- glue::glue(template, .open = "{{", .close = "}}")
+  x <- whisker::whisker.render(template)
   writeLines(x, con = outfile)
   if (!is.null(extra_css)) write_extra_css(extra_css, outfile)
   outfile

inst/resources/template.css

 @import url({{text_font_url}});
 @import url({{header_font_url}});
 @import url({{code_font_url}});
-{{extra_font_imports}}
+{{#extra_font_imports}}{{extra_font_imports}}{{/extra_font_imports}}
 
 body {
-  font-family: {{paste(text_font_family, text_font_family_fallback, text_font_base, sep = ", ")}};
+  font-family: {{body_font_family}};
   font-weight: {{text_font_weight}};
   color: {{text_color}};
 }
 .remark-slide-content {
   background-color: {{background_color}};
   font-size: {{text_font_size}};
-  {{ifelse(!is.na(background_image), paste0("background-image: url(", background_image, ");"), "")}}
-  {{ifelse(!is.na(background_image) && !is.na(background_size), paste0("background-size: ", background_size, ";"), "")}}
-  {{ifelse(!is.na(background_image) && !is.na(background_position), paste0("background-position: ", background_position, ";"), "")}}
+  {{#background_image}}
+  background-image: url({{background_image}});
+  {{#background_size}}background-size: {{background_size}};{{/background_size}}
+  {{#background_position}}background-position: {{background_position}};{{/background_position}}
+  {{/background_image}}
   padding: {{padding}};
 }
 .remark-slide-content h1 {
   font-size: {{code_font_size}};
 }
 .remark-inline-code {
+  {{#code_inline_color}}color: {{code_inline_color}};{{/code_inline_color}}
+  {{#code_inline_background_color}}
+  background-color: {{code_inline_background_color}};
+  padding: 2px;
+  {{/code_inline_background_color}}
   font-size: {{code_inline_font_size}};
-  {{ifelse(!is.na(code_inline_color), paste0("color: ", code_inline_color, ";"), "")}}
-  {{ifelse(!is.na(code_inline_background_color), paste0("background-color: ", code_inline_background_color, ";"), "")}}
-  {{ifelse(!is.na(code_inline_background_color), "padding: 2px;", "")}}
 }
 .remark-slide-number {
   color: {{text_slide_number_color}};
   opacity: 1;
   font-size: {{text_slide_number_font_size}};
 }
-{{ifelse(!is.na(text_bold_color), paste0("strong{color:", text_bold_color,";}"), "")}}
+{{#text_bold_color}}
+strong { color: {{text_bold_color}}; }
+{{/text_bold_color}}
 a, a > code {
   color: {{link_color}};
   text-decoration: none;
 }
 .footnote {
-  {{ifelse(!is.na(footnote_color), paste0("color: ", footnote_color, ";"), "")}}
+  {{#footnote_color}}color: {{footnote_color}};{{/footnote_color}}
   position: absolute;
   bottom: {{footnote_position_bottom}};
   padding-right: 4em;
 .inverse {
   background-color: {{inverse_background_color}};
   color: {{inverse_text_color}};
-  {{ifelse(inverse_text_shadow, "text-shadow: 0 0 20px #333;", "")}}
+  {{#inverse_text_shadow}}text-shadow: 0 0 20px #333;{{/inverse_text_shadow}}
 }
 .inverse h1, .inverse h2, .inverse h3 {
   color: {{inverse_header_color}};
 }
 .title-slide {
   background-color: {{title_slide_background_color}};
-  {{ifelse(!is.na(title_slide_background_image), paste0("background-image: url(", title_slide_background_image, ");"), "")}}
-  {{ifelse(!is.na(title_slide_background_size), paste0("background-size: ", title_slide_background_size, ";"), ifelse(!is.na(title_slide_background_image), "background-size: cover;", ""))}}
-  {{ifelse(!is.na(title_slide_background_position), paste0("background-position: ", title_slide_background_position, ";"), "")}}
+  {{#title_slide_background_image}}background-image: url("{{title_slide_background_image}}");{{/title_slide_background_image}}
+  {{#title_slide_background_size}}background-size: {{title_slide_background_size}};{{/title_slide_background_size}}
+  {{#title_slide_background_position}}background-position: {{title_slide_background_position}};{{/title_slide_background_position}}
 }
 .title-slide .remark-slide-number {
   display: none;
   border-top: 1px solid {{table_border_color}};
   border-bottom: 1px solid {{table_border_color}};
 }
-.remark-slide table thead th { border-bottom: 1px solid {{table_row_border_color}}; }
-th, td { padding: 5px; }
-.remark-slide thead, .remark-slide tfoot, .remark-slide tr:nth-child(even) { background: {{table_row_even_background_color}} }
+.remark-slide table thead th {
+  border-bottom: 1px solid {{table_row_border_color}};
+}
+th, td {
+  padding: 5px;
+}
+.remark-slide thead, .remark-slide tfoot, .remark-slide tr:nth-child(even) {
+  background: {{table_row_even_background_color}}
+}
 table.dataTable tbody {
   background-color: {{background_color}};
   color: {{text_color}};
   background-color: {{background_color}};
 }
 table.dataTable.display tbody tr.even {
-  background-color: {{ifelse(!is.na(table_row_even_background_color), table_row_even_background_color, background_color)}};
+  background-color: {{table_row_even_background_color}}
 }
 table.dataTable.hover tbody tr:hover, table.dataTable.display tbody tr:hover {
   background-color: rgba(255, 255, 255, 0.5);

inst/scripts/write_xaringan_theme_body.R

   }
 }
 
-# Handle background-image defaults
-if (!is.na(background_image)) {
-  if (is.na(background_size)) background_size <- ifelse(
-    is.na(background_position),
-    "cover",
-    "100%"
-  )
+extra_font_imports <- if (is.null(extra_fonts)) "" else list2fonts(extra_fonts)
+
+# convert NA arguments to NULL
+for (var in f_args) {
+  val <- eval(parse(text = var))
+  if (is.null(val)) next
+  is_na <- is.na(val)
+  if (is_na) assign(var, NULL)
 }
 
-extra_font_imports <- if (is.null(extra_fonts)) "" else list2fonts(extra_fonts)
+# prepare variables for template
+backround_size_fallback <- if (is.null(background_position)) "cover" else "100%"
+background_size <- background_image %??% (background_size %||% background_size_fallback)
+title_slide_background_size <- title_slide_background_size %||% (
+  title_slide_background_image %??% "cover"
+)
+table_row_even_background_color <- table_row_even_background_color %||% background_color
 
 tf <- system.file("resources", "template.css", package = "xaringanthemer")
 template <- readLines(tf, warn = FALSE)
 template <- paste(template, collapse = "\n")
-x <- glue::glue(template, .open = "{{", .close = "}}")
+x <- whisker::whisker.render(template)
 writeLines(x, con = outfile)
 if (!is.null(extra_css)) write_extra_css(extra_css, outfile)
 outfile

man/duo.Rd

   header_color = secondary_color, background_color = primary_color,
   link_color = secondary_color, text_bold_color = secondary_color,
   text_slide_number_color = text_color, padding = "1em 4em 1em 4em",
-  background_image = NA, background_size = NA,
-  background_position = NA,
+  background_image = NULL, background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = secondary_color,
-  code_inline_background_color = NA, code_inline_font_size = "1em",
+  code_inline_background_color = NULL, code_inline_font_size = "1em",
   inverse_background_color = secondary_color,
   inverse_text_color = primary_color, inverse_text_shadow = FALSE,
   inverse_header_color = primary_color,
   title_slide_text_color = secondary_color,
   title_slide_background_color = primary_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(secondary_color, 0.6),
   left_column_selected_color = secondary_color,
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to \code{secondary_color}. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{primary_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/duo_accent.Rd

   secondary_color),
   text_bold_color = choose_dark_or_light(secondary_color, primary_color,
   secondary_color), text_slide_number_color = primary_color,
-  padding = "1em 4em 1em 4em", background_image = NA,
-  background_size = NA, background_position = NA,
+  padding = "1em 4em 1em 4em", background_image = NULL,
+  background_size = NULL, background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = choose_dark_or_light(secondary_color,
-  primary_color, secondary_color), code_inline_background_color = NA,
+  primary_color, secondary_color), code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = secondary_color,
   inverse_text_color = choose_dark_or_light(secondary_color, black_color,
   title_slide_text_color = choose_dark_or_light(primary_color,
   black_color, white_color),
   title_slide_background_color = primary_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(primary_color, 0.6),
   left_column_selected_color = primary_color,
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to \code{choose_dark_or_light(secondary_color, primary_color, secondary_color)}. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{primary_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/duo_accent_inverse.Rd

   primary_color), text_bold_color = choose_dark_or_light(secondary_color,
   secondary_color, primary_color),
   text_slide_number_color = primary_color, padding = "1em 4em 1em 4em",
-  background_image = NA, background_size = NA,
-  background_position = NA,
+  background_image = NULL, background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
   code_inline_color = choose_dark_or_light(secondary_color,
-  secondary_color, primary_color), code_inline_background_color = NA,
+  secondary_color, primary_color), code_inline_background_color = NULL,
   code_inline_font_size = "1em",
   inverse_background_color = secondary_color,
   inverse_text_color = choose_dark_or_light(secondary_color, black_color,
   title_slide_text_color = choose_dark_or_light(primary_color,
   black_color, white_color),
   title_slide_background_color = primary_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(primary_color, 0.6),
   left_column_selected_color = primary_color,
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to \code{choose_dark_or_light(secondary_color, secondary_color, primary_color)}. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{primary_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/mono_accent.Rd

   header_color = base_color, background_color = white_color,
   link_color = base_color, text_bold_color = base_color,
   text_slide_number_color = base_color, padding = "1em 4em 1em 4em",
-  background_image = NA, background_size = NA,
-  background_position = NA,
+  background_image = NULL, background_size = NULL,
+  background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
-  code_inline_color = base_color, code_inline_background_color = NA,
+  code_inline_color = base_color, code_inline_background_color = NULL,
   code_inline_font_size = "1em", inverse_background_color = base_color,
   inverse_text_color = white_color, inverse_text_shadow = FALSE,
   inverse_header_color = white_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(base_color, 0.6),
   left_column_selected_color = base_color,
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to \code{base_color}. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{inverse_background_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/mono_accent_inverse.Rd

   text_color = white_color, header_color = base_color,
   background_color = black_color, link_color = base_color,
   text_bold_color = base_color, text_slide_number_color = base_color,
-  padding = "1em 4em 1em 4em", background_image = NA,
-  background_size = NA, background_position = NA,
+  padding = "1em 4em 1em 4em", background_image = NULL,
+  background_size = NULL, background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
-  code_inline_color = base_color, code_inline_background_color = NA,
+  code_inline_color = base_color, code_inline_background_color = NULL,
   code_inline_font_size = "1em", inverse_background_color = base_color,
   inverse_text_color = black_color, inverse_text_shadow = FALSE,
   inverse_header_color = black_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(base_color, 0.6),
   left_column_selected_color = base_color,
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to \code{base_color}. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{inverse_background_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/mono_dark.Rd

   text_color = white_color, header_color = base_color,
   background_color = black_color, link_color = base_color,
   text_bold_color = base_color, text_slide_number_color = base_color,
-  padding = "1em 4em 1em 4em", background_image = NA,
-  background_size = NA, background_position = NA,
+  padding = "1em 4em 1em 4em", background_image = NULL,
+  background_size = NULL, background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
-  code_inline_color = base_color, code_inline_background_color = NA,
+  code_inline_color = base_color, code_inline_background_color = NULL,
   code_inline_font_size = "1em", inverse_background_color = base_color,
   inverse_text_color = black_color, inverse_text_shadow = FALSE,
   inverse_header_color = black_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(base_color, 0.6),
   left_column_selected_color = base_color,
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to \code{base_color}. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{inverse_background_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/mono_light.Rd

   text_color = black_color, header_color = base_color,
   background_color = white_color, link_color = base_color,
   text_bold_color = base_color, text_slide_number_color = base_color,
-  padding = "1em 4em 1em 4em", background_image = NA,
-  background_size = NA, background_position = NA,
+  padding = "1em 4em 1em 4em", background_image = NULL,
+  background_size = NULL, background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
-  code_inline_color = base_color, code_inline_background_color = NA,
+  code_inline_color = base_color, code_inline_background_color = NULL,
   code_inline_font_size = "1em", inverse_background_color = base_color,
   inverse_text_color = white_color, inverse_text_shadow = FALSE,
   inverse_header_color = white_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = apply_alpha(base_color, 0.6),
   left_column_selected_color = base_color,
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to \code{base_color}. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{inverse_background_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/solarized_dark.Rd

 solarized_dark(text_color = "#839496", header_color = "#dc322f",
   background_color = "#002b36", link_color = "#b58900",
   text_bold_color = "#d33682", text_slide_number_color = "#586e75",
-  padding = "1em 4em 1em 4em", background_image = NA,
-  background_size = NA, background_position = NA,
+  padding = "1em 4em 1em 4em", background_image = NULL,
+  background_size = NULL, background_position = NULL,
   code_highlight_color = "#268bd240", code_inline_color = "#6c71c4",
-  code_inline_background_color = NA, code_inline_font_size = "1em",
+  code_inline_background_color = NULL, code_inline_font_size = "1em",
   inverse_background_color = "#fdf6e3", inverse_text_color = "#002b36",
   inverse_text_shadow = FALSE,
   inverse_header_color = inverse_text_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = "#586e75",
   left_column_selected_color = "#93a1a1",
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to #268bd240. Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to #6c71c4. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{inverse_background_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/solarized_light.Rd

 solarized_light(text_color = "#657b83", header_color = "#dc322f",
   background_color = "#fdf6e3", link_color = "#b58900",
   text_bold_color = "#d33682", text_slide_number_color = "#93a1a1",
-  padding = "1em 4em 1em 4em", background_image = NA,
-  background_size = NA, background_position = NA,
+  padding = "1em 4em 1em 4em", background_image = NULL,
+  background_size = NULL, background_position = NULL,
   code_highlight_color = "#268bd240", code_inline_color = "#6c71c4",
-  code_inline_background_color = NA, code_inline_font_size = "1em",
+  code_inline_background_color = NULL, code_inline_font_size = "1em",
   inverse_background_color = "#002b36", inverse_text_color = "#fdf6e3",
   inverse_text_shadow = FALSE,
   inverse_header_color = inverse_text_color,
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = "#93a1a1",
   left_column_selected_color = "#586e75",
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to #268bd240. Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to #6c71c4. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{inverse_background_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}
 

man/write_xaringan_theme.Rd

 \usage{
 write_xaringan_theme(text_color = "#000", header_color = "#000",
   background_color = "#FFF", link_color = "rgb(249, 38, 114)",
-  text_bold_color = NA,
+  text_bold_color = NULL,
   text_slide_number_color = inverse_background_color,
-  padding = "1em 4em 1em 4em", background_image = NA,
-  background_size = NA, background_position = NA,
+  padding = "1em 4em 1em 4em", background_image = NULL,
+  background_size = NULL, background_position = NULL,
   code_highlight_color = "rgba(255,255,0,0.5)",
-  code_inline_color = "#000", code_inline_background_color = NA,
+  code_inline_color = "#000", code_inline_background_color = NULL,
   code_inline_font_size = "1em", inverse_background_color = "#272822",
   inverse_text_color = "#d6d6d6", inverse_text_shadow = FALSE,
   inverse_header_color = "#f3f3f3",
   title_slide_text_color = inverse_text_color,
   title_slide_background_color = inverse_background_color,
-  title_slide_background_image = NA, title_slide_background_size = NA,
-  title_slide_background_position = NA, footnote_color = NA,
+  title_slide_background_image = NULL,
+  title_slide_background_size = NULL,
+  title_slide_background_position = NULL, footnote_color = NULL,
   footnote_font_size = "0.9em", footnote_position_bottom = "3em",
   left_column_subtle_color = "#777",
   left_column_selected_color = "#000",
 
 \item{link_color}{Link Color. Defaults to rgb(249, 38, 114). Modifies the \code{a, a > code} elements.}
 
-\item{text_bold_color}{Bold Text Color. Defaults to NA. Modifies the \code{strong} element.}
+\item{text_bold_color}{Bold Text Color. Defaults to \code{NULL}. Modifies the \code{strong} element.}
 
 \item{text_slide_number_color}{Slide Number Color. Defaults to \code{inverse_background_color}. Modifies the \code{.remark-slide-number} class.}
 
 \item{padding}{Slide Padding in \code{top right [bottom left]} format. Defaults to 1em 4em 1em 4em. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_image}{Background image applied to each \emph{and every} slide. Set \code{title_slide_background_image = "none"} to remove the background image from the title slide.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_size}{Background image size, requires \code{background_image} to be set. If \code{background_image} is set, \code{background_size} will default to \code{cover} so the backround fills the screen. If both \code{background_image} and \code{background_position} are set, will default to 100 percent.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
-\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to NA. Modifies the \code{.remark-slide-content} class.}
+\item{background_position}{Background image position, requires \code{background_image} to be set, and it is recommended to adjust \code{background_size}.. Defaults to \code{NULL}. Modifies the \code{.remark-slide-content} class.}
 
 \item{code_highlight_color}{Code Line Highlight. Defaults to rgba(255,255,0,0.5). Modifies the \code{.remark-code-line-highlighted} class.}
 
 \item{code_inline_color}{Inline Code Color. Defaults to #000. Modifies the \code{.remark-inline-code} class.}
 
-\item{code_inline_background_color}{Inline Code Background Color. Defaults to NA. Modifies the \code{.remark-inline-code} class.}
+\item{code_inline_background_color}{Inline Code Background Color. Defaults to \code{NULL}. Modifies the \code{.remark-inline-code} class.}
 
 \item{code_inline_font_size}{Inline Code Text Font Size. Defaults to 1em. Modifies the \code{.remark-inline-code} class.}
 
 
 \item{title_slide_background_color}{Title Slide Background Color. Defaults to \code{inverse_background_color}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_image}{Title Slide Background Image URL. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_size}{Title Slide Background Image Size, defaults to "cover" if background image is set. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to NA. Modifies the \code{.title-slide} class.}
+\item{title_slide_background_position}{Title Slide Background Image Position. Defaults to \code{NULL}. Modifies the \code{.title-slide} class.}
 
-\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to NA. Modifies the \code{.footnote} class.}
+\item{footnote_color}{Footnote text color (if \code{NA}, then it will be the same color as \code{text_color}). Defaults to \code{NULL}. Modifies the \code{.footnote} class.}
 
 \item{footnote_font_size}{Footnote font size. Defaults to 0.9em. Modifies the \code{.footnote} class.}