Change default fonts to Cabin (heading) and Noto Sans (body)

Closes #28

R/style_duo.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_duo_accent.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_duo_accent_inverse.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_mono_accent.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_mono_accent_inverse.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_mono_dark.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_mono_light.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_solarized_dark.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_solarized_light.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,

R/style_xaringan.R

 #' @param header_background_content_padding_top Top Padding for Content in Slide with Header with Background. Defaults to 7rem. Modifies the `.remark-slide-content` class.
 #' @param header_background_ignore_classes Slide Classes Where Header with Background will not be Applied. Defaults to `c('normal', 'inverse', 'title', 'middle', 'bottom')`. Modifies the `.remark-slide-content` class.
 #' @param text_slide_number_font_size Slide Number Text Font Size. Defaults to 0.9rem. Modifies the `.remark-slide-number` class.
-#' @param text_font_google Use `google_font()` to specify body font. Defaults to `NULL`. Modifies the `body` element.
-#' @param text_font_family Body Text Font Family. Defaults to 'Droid Serif'. Modifies the `body` element.
+#' @param text_font_google Use `google_font()` to specify body font. Defaults to `google_font("Noto Sans", "400", "400i", "700", "700i")`. Modifies the `body` element.
+#' @param text_font_family Body Text Font Family (xaringan default is `'Droid Serif'`). Defaults to `NULL`. Modifies the `body` element.
 #' @param text_font_weight Body Text Font Weight. Defaults to normal. Modifies the `body` element.
-#' @param text_font_url Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the `@import url()` elements.
+#' @param text_font_url Body Text Font URL(s). Defaults to `NULL`. Modifies the `@import url()` elements.
 #' @param text_font_family_fallback Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the `body` element.
 #' @param text_font_base Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the `body` element.
-#' @param header_font_google Use `google_font()` to specify header font. Defaults to `NULL`. Modifies the `body` element.
-#' @param header_font_family Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the `h1, h2, h3` elements.
+#' @param header_font_google Use `google_font()` to specify header font. Defaults to `google_font("Cabin", "600", "600i")`. Modifies the `body` element.
+#' @param header_font_family Header Font Family (xaringan default is `'Yanone Kaffeesatz'`). Defaults to `NULL`. Modifies the `h1, h2, h3` elements.
 #' @param header_font_weight Header Font Weight. Defaults to normal. Modifies the `h1, h2, h3` elements.
-#' @param header_font_url Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the `@import url` elements.
-#' @param code_font_google Use `google_font()` to specify code font. Defaults to `NULL`. Modifies the `body` element.
-#' @param code_font_family Code Font Family. Defaults to 'Source Code Pro'. Modifies the `.remark-code, .remark-inline-code` classes.
+#' @param header_font_url Header Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
+#' @param code_font_google Use `google_font()` to specify code font. Defaults to `google_font("Source Code Pro", "400", "700")`. Modifies the `body` element.
+#' @param code_font_family Code Font Family. Defaults to `NULL`. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param code_font_size Code Text Font Size. Defaults to 0.9rem. Modifies the `.remark-inline` class.
-#' @param code_font_url Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the `@import url` elements.
+#' @param code_font_url Code Font URL. Defaults to `NULL`. Modifies the `@import url` elements.
 #' @param code_font_family_fallback Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the `.remark-code, .remark-inline-code` classes.
 #' @param colors A named vector of custom colors. The names of the colors
 #'   become CSS variables and classes that can be used within your slides.
   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c('normal', 'inverse', 'title', 'middle', 'bottom'),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
-  text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
   text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
   # Make sure font names are wrapped in quotes if they have spaces
   f_args <- names(formals(sys.function()))
   for (var in f_args[grepl("font_family$", f_args)]) {
-    eval(parse(text = paste0(var, "<-quote_elements_w_spaces(", var, ")")))
+    var_value <- get(var, inherits = FALSE)
+    if (!is.null(var_value)) {
+      eval(parse(text = paste0(var, "<-quote_elements_w_spaces(", var, ")")))
+    }
     # set an is_google flag default of FALSE that is possibly overwritten later
     eval(parse(text = paste0(sub("font_family$", "font_is_google", var), "<-0")))
   }
       text_font_url <- gf$url
     } else {
       for (thing in c("family", "url")) {
-        eval(parse(text = paste0(group, "_font_", thing, " <- gf$", quote_elements_w_spaces(thing))))
+        eval(parse(text = paste0(group, "_font_", thing, " <- quote_elements_w_spaces(gf$", thing, ")")))
       }
     }
     eval(parse(text = paste0(group, "_font_is_google <- 1")))

R/theme_settings.R

   , "header_background_content_padding_top", "7rem", ".remark-slide-content", "Top Padding for Content in Slide with Header with Background"
   , "header_background_ignore_classes", "{c('normal', 'inverse', 'title', 'middle', 'bottom')}", ".remark-slide-content", "Slide Classes Where Header with Background will not be Applied"
   , "text_slide_number_font_size", "0.9rem", ".remark-slide-number", "Slide Number Text Font Size"
-  , "text_font_google", NULL, "body", "Use `google_font()` to specify body font"
-  , "text_font_family", "'Droid Serif'", "body", "Body Text Font Family"
+  , "text_font_google", "{google_font(\"Noto Sans\", \"400\", \"400i\", \"700\", \"700i\")}", "body", "Use `google_font()` to specify body font"
+  , "text_font_family", NULL, "body", "Body Text Font Family (xaringan default is `'Droid Serif'`)"
   , "text_font_weight", "normal", "body", "Body Text Font Weight"
-  , "text_font_url", "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic", "@import url()", "Body Text Font URL(s)"
+  , "text_font_url", NULL, "@import url()", "Body Text Font URL(s)"
   , "text_font_family_fallback", "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'", "body", "Body Text Font Fallbacks"
   , "text_font_base", "serif", "body", "Body Text Base Font (Total Failure Fallback)"
-  , "header_font_google", NULL, "body", "Use `google_font()` to specify header font"
-  , "header_font_family", "'Yanone Kaffeesatz'", "h1, h2, h3", "Header Font Family"
+  , "header_font_google", "{google_font(\"Cabin\", \"600\", \"600i\")}", "body", "Use `google_font()` to specify header font"
+  , "header_font_family", NULL, "h1, h2, h3", "Header Font Family (xaringan default is `'Yanone Kaffeesatz'`)"
   , "header_font_weight", "normal", "h1, h2, h3", "Header Font Weight"
-  , "header_font_url", "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz", "@import url", "Header Font URL"
-  , "code_font_google", NULL, "body", "Use `google_font()` to specify code font"
-  , "code_font_family", "'Source Code Pro'", ".remark-code, .remark-inline-code", "Code Font Family"
+  , "header_font_url", NULL, "@import url", "Header Font URL"
+  , "code_font_google", "{google_font(\"Source Code Pro\", \"400\", \"700\")}", "body", "Use `google_font()` to specify code font"
+  , "code_font_family", NULL, ".remark-code, .remark-inline-code", "Code Font Family"
   , "code_font_size", "0.9rem", ".remark-inline", "Code Text Font Size"
-  , "code_font_url", "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700", "@import url", "Code Font URL"
+  , "code_font_url", NULL, "@import url", "Code Font URL"
   , "code_font_family_fallback", "'Lucida Console', Monaco", ".remark-code, .remark-inline-code", "Code Font Fallback"
 )
 

inst/scripts/style_xaringan_body.R

 # Make sure font names are wrapped in quotes if they have spaces
 f_args <- names(formals(sys.function()))
 for (var in f_args[grepl("font_family$", f_args)]) {
-  eval(parse(text = paste0(var, "<-quote_elements_w_spaces(", var, ")")))
+  var_value <- get(var, inherits = FALSE)
+  if (!is.null(var_value)) {
+    eval(parse(text = paste0(var, "<-quote_elements_w_spaces(", var, ")")))
+  }
   # set an is_google flag default of FALSE that is possibly overwritten later
   eval(parse(text = paste0(sub("font_family$", "font_is_google", var), "<-0")))
 }
     text_font_url <- gf$url
   } else {
     for (thing in c("family", "url")) {
-      eval(parse(text = paste0(group, "_font_", thing, " <- gf$", quote_elements_w_spaces(thing))))
+      eval(parse(text = paste0(group, "_font_", thing, " <- quote_elements_w_spaces(gf$", thing, ")")))
     }
   }
   eval(parse(text = paste0(group, "_font_is_google <- 1")))

man/style_duo.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_duo_accent.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_duo_accent_inverse.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_mono_accent.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_mono_accent_inverse.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_mono_dark.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_mono_light.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_solarized_dark.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_solarized_light.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

man/style_xaringan.Rd

   header_background_content_padding_top = "7rem",
   header_background_ignore_classes = c("normal", "inverse", "title", "middle", "bottom"),
   text_slide_number_font_size = "0.9rem",
-  text_font_google = NULL,
-  text_font_family = "'Droid Serif'",
+  text_font_google = google_font("Noto Sans", "400", "400i", "700", "700i"),
+  text_font_family = NULL,
   text_font_weight = "normal",
- 
-    text_font_url = "https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic",
+  text_font_url = NULL,
  
     text_font_family_fallback = "'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'",
   text_font_base = "serif",
-  header_font_google = NULL,
-  header_font_family = "'Yanone Kaffeesatz'",
+  header_font_google = google_font("Cabin", "600", "600i"),
+  header_font_family = NULL,
   header_font_weight = "normal",
-  header_font_url = "https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz",
-  code_font_google = NULL,
-  code_font_family = "'Source Code Pro'",
+  header_font_url = NULL,
+  code_font_google = google_font("Source Code Pro", "400", "700"),
+  code_font_family = NULL,
   code_font_size = "0.9rem",
-  code_font_url = "https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700",
+  code_font_url = NULL,
   code_font_family_fallback = "'Lucida Console', Monaco",
   colors = NULL,
   extra_css = NULL,
 
 \item{text_slide_number_font_size}{Slide Number Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-slide-number} class.}
 
-\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{text_font_google}{Use \code{google_font()} to specify body font. Defaults to \code{google_font("Noto Sans", "400", "400i", "700", "700i")}. Modifies the \code{body} element.}
 
-\item{text_font_family}{Body Text Font Family. Defaults to 'Droid Serif'. Modifies the \code{body} element.}
+\item{text_font_family}{Body Text Font Family (xaringan default is \code{'Droid Serif'}). Defaults to \code{NULL}. Modifies the \code{body} element.}
 
 \item{text_font_weight}{Body Text Font Weight. Defaults to normal. Modifies the \code{body} element.}
 
-\item{text_font_url}{Body Text Font URL(s). Defaults to https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic. Modifies the \verb{@import url()} elements.}
+\item{text_font_url}{Body Text Font URL(s). Defaults to \code{NULL}. Modifies the \verb{@import url()} elements.}
 
 \item{text_font_family_fallback}{Body Text Font Fallbacks. Defaults to 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC'. Modifies the \code{body} element.}
 
 \item{text_font_base}{Body Text Base Font (Total Failure Fallback). Defaults to serif. Modifies the \code{body} element.}
 
-\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{header_font_google}{Use \code{google_font()} to specify header font. Defaults to \code{google_font("Cabin", "600", "600i")}. Modifies the \code{body} element.}
 
-\item{header_font_family}{Header Font Family. Defaults to 'Yanone Kaffeesatz'. Modifies the \verb{h1, h2, h3} elements.}
+\item{header_font_family}{Header Font Family (xaringan default is \code{'Yanone Kaffeesatz'}). Defaults to \code{NULL}. Modifies the \verb{h1, h2, h3} elements.}
 
 \item{header_font_weight}{Header Font Weight. Defaults to normal. Modifies the \verb{h1, h2, h3} elements.}
 
-\item{header_font_url}{Header Font URL. Defaults to https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz. Modifies the \verb{@import url} elements.}
+\item{header_font_url}{Header Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
-\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{NULL}. Modifies the \code{body} element.}
+\item{code_font_google}{Use \code{google_font()} to specify code font. Defaults to \code{google_font("Source Code Pro", "400", "700")}. Modifies the \code{body} element.}
 
-\item{code_font_family}{Code Font Family. Defaults to 'Source Code Pro'. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
+\item{code_font_family}{Code Font Family. Defaults to \code{NULL}. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 
 \item{code_font_size}{Code Text Font Size. Defaults to 0.9rem. Modifies the \code{.remark-inline} class.}
 
-\item{code_font_url}{Code Font URL. Defaults to https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700. Modifies the \verb{@import url} elements.}
+\item{code_font_url}{Code Font URL. Defaults to \code{NULL}. Modifies the \verb{@import url} elements.}
 
 \item{code_font_family_fallback}{Code Font Fallback. Defaults to 'Lucida Console', Monaco. Modifies the \verb{.remark-code, .remark-inline-code} classes.}
 

tests/testthat/css/duo-header_bg.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/duo.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/duo_accent.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/duo_accent_inverse.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/mono_accent.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/mono_accent_inverse.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/mono_dark.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/mono_light-header_bg.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/mono_light.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/solarized_dark-header_bg.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/solarized_dark.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/solarized_light.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/css/xaringan.css

  *
  * ------------------------------------------------------- */
 @import url(https://fonts.googleapis.com/css?family=Noto+Serif);
-@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
-@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400,700);
+@import url(https://fonts.googleapis.com/css?family=Cabin:600, 600i);
+@import url(https://fonts.googleapis.com/css?family=Source+Code+Pro:400, 700);
 
 
 :root {
   --text-font-is-google: 1;
   --text-font-family-fallback: 'Palatino Linotype', 'Book Antiqua', Palatino, 'Microsoft YaHei', 'Songti SC';
   --text-font-base: serif;
-  --header-font-family: 'Yanone Kaffeesatz';
-  --header-font-is-google: 0;
+  --header-font-family: Cabin;
+  --header-font-is-google: 1;
   --code-font-family: 'Source Code Pro';
-  --code-font-is-google: 0;
+  --code-font-is-google: 1;
   --base-font-size: 20px;
   --text-font-size: 1rem;
   --code-font-size: 0.9rem;

tests/testthat/test-css.R

     header_h3_font_size = "1.75rem",
     text_font_family = "'Noto Serif'",
     text_font_is_google = TRUE,
-    header_font_family = "'Yanone Kaffeesatz'",
-    header_font_is_google = FALSE,
+    header_font_family = "Cabin",
+    header_font_is_google = TRUE,
     header_background_color = "#23395b",
     header_background_text_color = "#E9EBEE",
     code_font_family = "'Source Code Pro'",
-    code_font_is_google = FALSE
+    code_font_is_google = TRUE
   )
 
   css_vars <- read_css_vars(testthat::test_path("css/mono_light.css"))