Add text_bold_font_weight argument and css rule

Fixes #50

NEWS.md

 # xaringanthemer (development version)
 
+* Added `text_bold_font_weight` argument to xaringanthemer style functions with
+  a corresponding CSS rule setting the `font-weight` property of `<strong>`
+  elements (thanks @matiasandina, #50).
+
 # xaringanthemes 0.3.4
 
 * Maintenance release to avoid issues with upcoming R 4.1.0 (#49)

R/style_duo.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_duo_accent.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_duo_accent_inverse.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_mono_accent.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_mono_accent_inverse.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_mono_dark.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_mono_light.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_solarized_dark.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_solarized_light.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

R/style_xaringan.R

 #'   element. Accepts CSS
 #'   [font-weight](https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight)
 #'   property values.
+#' @param text_bold_font_weight Body Bold Text Font Weight. Defaults to bold.
+#'   Modifies the `strong` element.
 #' @param text_font_url Body Text Font URL(s). Defaults to
 #'   `xaringanthemer_font_default("text_font_url")`. Modifies the
 #'   `@import url()` elements.
   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",

data-raw/theme_template_variables.R

   , "text_font_google", "{NULL}", "body", "Use `google_font()` to specify body font", NA_character_
   , "text_font_family", '{xaringanthemer_font_default("text_font_family")}', "body", "Body Text Font Family (xaringan default is `'Droid Serif'`)", "--text-font-family"
   , "text_font_weight", '{xaringanthemer_font_default("text_font_weight")}', "body", "Body Text Font Weight", NA_character_
+  , "text_bold_font_weight", 'bold', "strong", "Body Bold Text Font Weight", NA_character_
   , "text_font_url", '{xaringanthemer_font_default("text_font_url")}', "@import url()", "Body Text Font URL(s)", NA_character_
   , "text_font_family_fallback", '{xaringanthemer_font_default("text_font_family_fallback")}', "body", "Body Text Font Fallbacks", "--text-font-family-fallback"
   , "text_font_base", "sans-serif", "body", "Body Text Base Font (Total Failure Fallback)", "--text-font-base"

inst/resources/template.css

   opacity: 1;
   font-size: {{text_slide_number_font_size}};
 }
-{{#text_bold_color}}
-strong { color: var(--text-bold-color); }
-{{/text_bold_color}}
+strong {
+  font-weight: {{text_bold_font_weight}};{{#text_bold_color}}
+  color: var(--text-bold-color);{{/text_bold_color}}
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

man/style_duo.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_duo_accent.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_duo_accent_inverse.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_mono_accent.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_mono_accent_inverse.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_mono_dark.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_mono_light.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_solarized_dark.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_solarized_light.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

man/style_xaringan.Rd

   text_font_google = NULL,
   text_font_family = xaringanthemer_font_default("text_font_family"),
   text_font_weight = xaringanthemer_font_default("text_font_weight"),
+  text_bold_font_weight = "bold",
   text_font_url = xaringanthemer_font_default("text_font_url"),
   text_font_family_fallback = xaringanthemer_font_default("text_font_family_fallback"),
   text_font_base = "sans-serif",
 \href{https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight}{font-weight}
 property values.}
 
+\item{text_bold_font_weight}{Body Bold Text Font Weight. Defaults to bold.
+Modifies the \code{strong} element.}
+
 \item{text_font_url}{Body Text Font URL(s). Defaults to
 \code{xaringanthemer_font_default("text_font_url")}. Modifies the
 \verb{@import url()} elements.}

tests/testthat/css/duo-header_bg.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/duo.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/duo_accent.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/duo_accent_inverse.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/google_fonts.css

   opacity: 1;
   font-size: 0.9em;
 }
+strong {
+  font-weight: bold;
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/mono_accent.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/mono_accent_inverse.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/mono_dark.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/mono_light-header_bg.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/mono_light.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/solarized_dark-header_bg.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/solarized_dark.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/solarized_light.css

   opacity: 1;
   font-size: 0.9em;
 }
-strong { color: var(--text-bold-color); }
+strong {
+  font-weight: bold;
+  color: var(--text-bold-color);
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;

tests/testthat/css/xaringan.css

   opacity: 1;
   font-size: 0.9em;
 }
+strong {
+  font-weight: bold;
+}
 a, a > code {
   color: var(--link-color);
   text-decoration: none;