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493 lines
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HTML
493 lines
38 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta name="description" content="Bootstrap’s resizing engine responsively scales common CSS properties to better utilize available space across viewports and devices.">
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<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
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<meta name="generator" content="Hugo 0.79.0">
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<title>RFS · Bootstrap v5.0</title>
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<meta name="twitter:title" content="RFS">
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<li><a href="/docs/5.0/getting-started/rfs/" class="d-inline-flex align-items-center rounded active" aria-current="page">RFS</a></li>
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<a class="btn btn-sm btn-bd-light mb-2 mb-md-0" href="https://github.com/twbs/bootstrap/blob/main/site/content/docs/5.0/getting-started/rfs.md" title="View and edit this file on GitHub" target="_blank" rel="noopener">View on GitHub</a>
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<h1 class="bd-title" id="content">RFS</h1>
|
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</div>
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<p class="bd-lead">Bootstrap’s resizing engine responsively scales common CSS properties to better utilize available space across viewports and devices.</p>
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<script async src="https://cdn.carbonads.com/carbon.js?serve=CKYIKKJL&placement=getbootstrapcom" id="_carbonads_js"></script>
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<div class="bd-toc mt-4 mb-5 my-md-0 ps-xl-3 mb-lg-5 text-muted">
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<strong class="d-block h6 my-2 pb-2 border-bottom">On this page</strong>
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<nav id="TableOfContents">
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<ul>
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<li><a href="#what-is-rfs">What is RFS?</a></li>
|
|
<li><a href="#using-rfs">Using RFS</a>
|
|
<ul>
|
|
<li><a href="#using-the-mixins">Using the mixins</a></li>
|
|
<li><a href="#using-the-functions">Using the functions</a></li>
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</ul>
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<li><a href="#extended-documentation">Extended documentation</a></li>
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<div class="bd-content ps-lg-4">
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<h2 id="what-is-rfs">What is RFS?</h2>
|
|
<p>Bootstrap’s side project <a href="https://github.com/twbs/rfs/tree/v9.0.3">RFS</a> 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 <code>margin</code>, <code>padding</code>, <code>border-radius</code>, or even <code>box-shadow</code>.</p>
|
|
<p>The mechanism automatically calculates the appropriate values based on the dimensions of the browser viewport. It will be compiled into <code>calc()</code> functions with a mix of <code>rem</code> and viewport units to enable the responsive scaling behavior.</p>
|
|
<h2 id="using-rfs">Using RFS</h2>
|
|
<p>The mixins are included in Bootstrap and are available once you include Bootstrap’s <code>scss</code>. RFS can also be <a href="https://github.com/twbs/rfs/tree/v9.0.3#installation">installed standalone</a> if needed.</p>
|
|
<h3 id="using-the-mixins">Using the mixins</h3>
|
|
<p>The <code>rfs()</code> mixin has shorthands for <code>font-size</code>, <code>margin</code>, <code>margin-top</code>, <code>margin-right</code>, <code>margin-bottom</code>, <code>margin-left</code>, <code>padding</code>, <code>padding-top</code>, <code>padding-right</code>, <code>padding-bottom</code>, and <code>padding-left</code>. See the example below for source Sass and compiled CSS.</p>
|
|
<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="nc">.title</span> <span class="p">{</span>
|
|
<span class="k">@include</span><span class="nd"> font-size</span><span class="p">(</span><span class="mi">4</span><span class="kt">rem</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div><div class="highlight"><pre class="chroma"><code class="language-css" data-lang="css"><span class="p">.</span><span class="nc">title</span> <span class="p">{</span>
|
|
<span class="k">font-size</span><span class="p">:</span> <span class="nb">calc</span><span class="p">(</span><span class="mf">1.525</span><span class="kt">rem</span> <span class="o">+</span> <span class="mf">3.3</span><span class="kt">vw</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
|
|
<span class="p">@</span><span class="k">media</span> <span class="o">(</span><span class="nt">min-width</span><span class="o">:</span> <span class="nt">1200px</span><span class="o">)</span> <span class="p">{</span>
|
|
<span class="p">.</span><span class="nc">title</span> <span class="p">{</span>
|
|
<span class="k">font-size</span><span class="p">:</span> <span class="mi">4</span><span class="kt">rem</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div><p>Any other property can be passed to the <code>rfs()</code> mixin like this:</p>
|
|
<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="nc">.selector</span> <span class="p">{</span>
|
|
<span class="k">@include</span><span class="nd"> rfs</span><span class="p">(</span><span class="mi">4</span><span class="kt">rem</span><span class="o">,</span> <span class="no">border</span><span class="o">-</span><span class="n">radius</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div><p><code>!important</code> can also just be added to whatever value you want:</p>
|
|
<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="nc">.selector</span> <span class="p">{</span>
|
|
<span class="k">@include</span><span class="nd"> padding</span><span class="p">(</span><span class="mi">2</span><span class="mf">.5</span><span class="kt">rem</span> <span class="nv">!important</span><span class="p">);</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div><h3 id="using-the-functions">Using the functions</h3>
|
|
<p>When you don’t want to use the includes, there are also two functions:</p>
|
|
<ul>
|
|
<li><code>rfs-value()</code> converts a value into a <code>rem</code> value if a <code>px</code> value is passed, in other cases it returns the same result.</li>
|
|
<li><code>rfs-fluid-value()</code> returns the fluid version of a value if the property needs rescaling.</li>
|
|
</ul>
|
|
<p>In this example, we use one of Bootstrap’s built-in <a href="/docs/5.0/layout/breakpoints/">responsive breakpoint mixins</a> to only apply styling below the <code>lg</code> breakpoint.</p>
|
|
<div class="highlight"><pre class="chroma"><code class="language-scss" data-lang="scss"><span class="nc">.selector</span> <span class="p">{</span>
|
|
<span class="k">@include</span><span class="nd"> media-breakpoint-down</span><span class="p">(</span><span class="n">lg</span><span class="p">)</span> <span class="p">{</span>
|
|
<span class="nt">padding</span><span class="nd">:</span> <span class="nt">rfs-fluid-value</span><span class="o">(</span><span class="nt">2rem</span><span class="o">)</span><span class="p">;</span>
|
|
<span class="nt">font-size</span><span class="nd">:</span> <span class="nt">rfs-fluid-value</span><span class="o">(</span><span class="nt">1</span><span class="nc">.125rem</span><span class="o">)</span><span class="p">;</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div><div class="highlight"><pre class="chroma"><code class="language-css" data-lang="css"><span class="p">@</span><span class="k">media</span> <span class="o">(</span><span class="nt">max-width</span><span class="o">:</span> <span class="nt">991</span><span class="p">.</span><span class="nc">98px</span><span class="o">)</span> <span class="p">{</span>
|
|
<span class="p">.</span><span class="nc">selector</span> <span class="p">{</span>
|
|
<span class="k">padding</span><span class="p">:</span> <span class="nb">calc</span><span class="p">(</span><span class="mf">1.325</span><span class="kt">rem</span> <span class="o">+</span> <span class="mf">0.9</span><span class="kt">vw</span><span class="p">);</span>
|
|
<span class="k">font-size</span><span class="p">:</span> <span class="mf">1.125</span><span class="kt">rem</span><span class="p">;</span> <span class="c">/* 1.125rem is small enough, so RFS won't rescale this */</span>
|
|
<span class="p">}</span>
|
|
<span class="p">}</span>
|
|
</code></pre></div><h2 id="extended-documentation">Extended documentation</h2>
|
|
<p>RFS is a separate project under the Bootstrap organization. More about RFS and its configuration can be found on its <a href="https://github.com/twbs/rfs/tree/v9.0.3">GitHub repository</a>.</p>
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</div>
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