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Responsive font size implementation (#23816)

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Martijn Cuppens
2019-02-07 23:32:05 +01:00
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commit 51375abca5
35 changed files with 324 additions and 124 deletions
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site/docs/4.2/content/typography.md
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@@ -104,7 +104,7 @@ Use the included utility classes to recreate the small secondary heading text fr
## Display headings
Traditional heading elements are designed to work best in the meat of your page content. When you need a heading to stand out, consider using a **display heading**—a larger, slightly more opinionated heading style.
Traditional heading elements are designed to work best in the meat of your page content. When you need a heading to stand out, consider using a **display heading**—a larger, slightly more opinionated heading style. Keep in mind these headings are not responsive by default, but it's possible to enable [responsive font sizes](#responsive-font-sizes).
<div class="bd-example bd-example-type">
<table class="table">
@@ -294,32 +294,8 @@ Align terms and descriptions horizontally by using our grid system's predefined
{% endcapture %}
{% include example.html content=example %}
## Responsive typography
## Responsive font sizes
*Responsive typography* refers to scaling text and components by simply adjusting the root element's `font-size` within a series of media queries. Bootstrap doesn't do this for you, but it's fairly easy to add if you need it.
Bootstrap v4.3 ships with the option to enable responsive font sizes, allowing text to scale more naturally across device and viewport sizes. <abbr title="Responsive font sizes">RFS</abbr> can be enabled by changing the `$enable-responsive-font-sizes` Sass variable to `true` and recompiling Bootstrap.
Here's an example of it in practice. Choose whatever `font-size`s and media queries you wish.
{% highlight scss %}
html {
font-size: 1rem;
}
@include media-breakpoint-up(sm) {
html {
font-size: 1.2rem;
}
}
@include media-breakpoint-up(md) {
html {
font-size: 1.4rem;
}
}
@include media-breakpoint-up(lg) {
html {
font-size: 1.6rem;
}
}
{% endhighlight %}
To support <abbr title="Responsive font sizes">RFS</abbr>, we use a Sass mixin to replace our normal `font-size` properties. Responsive font sizes will be compiled into `calc()` functions with a mix of `rem` and viewport units to enable the responsive scaling behavior. More about <abbr title="Responsive font sizes">RFS</abbr> and its configuration can be found on its [GitHub repository](https://github.com/twbs/rfs).