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Mark Otto 2019-10-28 09:08:19 +02:00 committed by XhmikosR
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site/content/docs/4.3/content/typography.md
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@ -272,4 +272,4 @@ Align terms and descriptions horizontally by using our grid system's predefined
## Responsive font sizes
In Bootstrap `v5`, we've enabled responsive font sizes by default, allowing text to scale more naturally across device and viewport sizes. Have a look at the [RFS]({{< docsref "/getting-started/rfs" >}}) page to find out how this works.
In Bootstrap 5, we've enabled responsive font sizes by default, allowing text to scale more naturally across device and viewport sizes. Have a look at the [RFS page]({{< docsref "/getting-started/rfs" >}}) to find out how this works.

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site/content/docs/4.3/getting-started/rfs.md
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@ -1,14 +1,14 @@
---
layout: docs
title: RFS
description: Bootstrap's resizing engine.
description: Bootstrap's resizing engine responsively scales common CSS properties to better utilize available space across viewports and devices.
group: getting-started
toc: true
---
## What is RFS?
Bootstrap's side project [RFS](https://github.com/twbs/rfs) is a unit resizing engine which was initially developed to resize font sizes (hence its abbreviation for Responsive Font Sizes). Nowadays RFS is capable of rescaling basically every value for any css property with units, like `margin`, `padding`, `border-radius` or even `box-shadow`.
Bootstrap's side project [RFS](https://github.com/twbs/rfs) is a unit resizing engine which was initially developed to resize font sizes (hence its abbreviation for Responsive Font Sizes). Nowadays RFS is capable of rescaling most CSS properties with unit values like `margin`, `padding`, `border-radius`, or even `box-shadow`.
The mechanism automatically calculates the appropriate values based on the dimensions of the browser viewport. It will be compiled into `calc()` functions with a mix of `rem` and viewport units to enable the responsive scaling behavior.
@ -18,7 +18,7 @@ The mixins are included in Bootstrap and are available once you include Bootstra
### Using the mixins
The `rfs()` mixin has shorthands for `font-size`, `margin`, `margin-top`, `margin-right`, `margin-bottom`, `margin-left`, `padding`, `padding-top`, `padding-right`, `padding-bottom` and `padding-left` which can be used like this:
The `rfs()` mixin has shorthands for `font-size`, `margin`, `margin-top`, `margin-right`, `margin-bottom`, `margin-left`, `padding`, `padding-top`, `padding-right`, `padding-bottom`, and `padding-left`. See the example below for source Sass and compiled CSS.
```scss
.title {
@ -26,8 +26,6 @@ The `rfs()` mixin has shorthands for `font-size`, `margin`, `margin-top`, `margi
}
```
which outputs the following CSS:
```css
.title {
font-size: calc(1.525rem + 3.3vw);
@ -83,4 +81,4 @@ In this example we use one of Bootstrap's built-in [responsive breakpoint mixins
## Extended documentation
RFS is a separate project under the Bootstrap organisation. More about RFS and its configuration can be found on its [GitHub repository](https://github.com/twbs/rfs).
RFS is a separate project under the Bootstrap organization. More about RFS and its configuration can be found on its [GitHub repository](https://github.com/twbs/rfs).