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Rem units with px fallback

@import 'compass/support';

/*
 * Takes a single value or a list of values and replaces px units with rem
 * Zero values will remain 0
 * Non-px values will not be modified
 *
 * Example (with $base-font-size : 16px)
 *
 * $input  : 0px 16px 2% 8px;
 * $output : 0 1rem 2% 0.5rem;
 */
@function px-to-rem($px) {
    $return : ();

    @each $var in $px {
        @if type-of($var) == 'number' and unit($var) == 'px' and abs($var) > 0 {
            $return : append($return, #{$var/$base-font-size}rem, space);
        } @else {
            $return : append($return, $var, space);
        }
    }

    @return $return;
}

/*
 * Output a selector with px fallback and rem values, so that modern browsers will use the rem values.
 * Both multiple selectors and multiple sizes in multiple units can be provided.
 *
 * Usage example:
 * 
 * .navbar {
 *     @include rem(height line-height, 48px); // multiple selectors
 *     @include rem(padding, 16px 8px 2% 0px); // multiple units, only px will be converted
 *     @include rem(border-bottom, rhythm(.5) solid red); // Rhythm: http://compass-style.org/reference/compass/typography/vertical_rhythm/
 * }
 *
 * Produces:
 * 
 * .navbar {
 *     height: 48px;
 *     height: 3rem; // given a font-size of 16px
 *     line-height: 48px;
 *     line-height: 3 rem;
 *     padding: 16px 8px 2% 0;
 *     padding: 1rem 0.5rem 2% 0;
 *     border-bottom: 12px solid red;
 *     border-bottom: 0.75rem solid red;
 * }
 */
@mixin rem($selectors, $size) {
    @each $selector in $selectors {
    	@if $legacy-support-for-ie {
            #{$selector}: $size;
        }
        #{$selector}: px-to-rem($size);
    }
}
https://snipt.net/embed/bc36c9a21aff47d5fcf4a247d181c1db/
/raw/bc36c9a21aff47d5fcf4a247d181c1db/
bc36c9a21aff47d5fcf4a247d181c1db
scss
SCSS
59
2019-07-16T06:00:16
True
False
False
/api/public/snipt/55203/
rem-units-with-px-fallback
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><a href="#L-1"> 1</a> <a href="#L-2"> 2</a> <a href="#L-3"> 3</a> <a href="#L-4"> 4</a> <a href="#L-5"> 5</a> <a href="#L-6"> 6</a> <a href="#L-7"> 7</a> <a href="#L-8"> 8</a> <a href="#L-9"> 9</a> <a href="#L-10">10</a> <a href="#L-11">11</a> <a href="#L-12">12</a> <a href="#L-13">13</a> <a href="#L-14">14</a> <a href="#L-15">15</a> <a href="#L-16">16</a> <a href="#L-17">17</a> <a href="#L-18">18</a> <a href="#L-19">19</a> <a href="#L-20">20</a> <a href="#L-21">21</a> <a href="#L-22">22</a> <a href="#L-23">23</a> <a href="#L-24">24</a> <a href="#L-25">25</a> <a href="#L-26">26</a> <a href="#L-27">27</a> <a href="#L-28">28</a> <a href="#L-29">29</a> <a href="#L-30">30</a> <a href="#L-31">31</a> <a href="#L-32">32</a> <a href="#L-33">33</a> <a href="#L-34">34</a> <a href="#L-35">35</a> <a href="#L-36">36</a> <a href="#L-37">37</a> <a href="#L-38">38</a> <a href="#L-39">39</a> <a href="#L-40">40</a> <a href="#L-41">41</a> <a href="#L-42">42</a> <a href="#L-43">43</a> <a href="#L-44">44</a> <a href="#L-45">45</a> <a href="#L-46">46</a> <a href="#L-47">47</a> <a href="#L-48">48</a> <a href="#L-49">49</a> <a href="#L-50">50</a> <a href="#L-51">51</a> <a href="#L-52">52</a> <a href="#L-53">53</a> <a href="#L-54">54</a> <a href="#L-55">55</a> <a href="#L-56">56</a> <a href="#L-57">57</a> <a href="#L-58">58</a> <a href="#L-59">59</a></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="k">@import</span> <span class="s1">&#39;</span><span class="s2">compass/support&#39;</span><span class="p">;</span> </span><span id="L-2"><a name="L-2"></a> </span><span id="L-3"><a name="L-3"></a><span class="cm">/*</span> </span><span id="L-4"><a name="L-4"></a><span class="cm"> * Takes a single value or a list of values and replaces px units with rem</span> </span><span id="L-5"><a name="L-5"></a><span class="cm"> * Zero values will remain 0</span> </span><span id="L-6"><a name="L-6"></a><span class="cm"> * Non-px values will not be modified</span> </span><span id="L-7"><a name="L-7"></a><span class="cm"> *</span> </span><span id="L-8"><a name="L-8"></a><span class="cm"> * Example (with $base-font-size : 16px)</span> </span><span id="L-9"><a name="L-9"></a><span class="cm"> *</span> </span><span id="L-10"><a name="L-10"></a><span class="cm"> * $input : 0px 16px 2% 8px;</span> </span><span id="L-11"><a name="L-11"></a><span class="cm"> * $output : 0 1rem 2% 0.5rem;</span> </span><span id="L-12"><a name="L-12"></a><span class="cm"> */</span> </span><span id="L-13"><a name="L-13"></a><span class="k">@function</span> <span class="nt">px-to-rem</span><span class="o">(</span><span class="err">$</span><span class="nt">px</span><span class="o">)</span> <span class="p">{</span> </span><span id="L-14"><a name="L-14"></a> <span class="nv">$return</span><span class="o"> :</span> <span class="p">();</span> </span><span id="L-15"><a name="L-15"></a> </span><span id="L-16"><a name="L-16"></a> <span class="k">@each</span> <span class="err">$</span><span class="nt">var</span> <span class="nt">in</span> <span class="err">$</span><span class="nt">px</span> <span class="p">{</span> </span><span id="L-17"><a name="L-17"></a> <span class="k">@if</span> <span class="nf">type-of</span><span class="p">(</span><span class="nv">$var</span><span class="p">)</span> <span class="o">==</span> <span class="s1">&#39;</span><span class="s2">number&#39;</span> <span class="ow">and</span> <span class="nf">unit</span><span class="p">(</span><span class="nv">$var</span><span class="p">)</span> <span class="o">==</span> <span class="s1">&#39;</span><span class="s2">px&#39;</span> <span class="ow">and</span> <span class="nf">abs</span><span class="p">(</span><span class="nv">$var</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">0</span> <span class="p">{</span> </span><span id="L-18"><a name="L-18"></a> <span class="nv">$return</span><span class="o"> :</span> <span class="nf">append</span><span class="p">(</span><span class="nv">$return</span><span class="o">,</span> <span class="si">#{</span><span class="nv">$var</span><span class="o">/</span><span class="nv">$base-font-size</span><span class="si">}</span><span class="n">rem</span><span class="o">,</span> <span class="n">space</span><span class="p">);</span> </span><span id="L-19"><a name="L-19"></a> <span class="p">}</span> <span class="k">@else</span> <span class="p">{</span> </span><span id="L-20"><a name="L-20"></a> <span class="nv">$return</span><span class="o"> :</span> <span class="nf">append</span><span class="p">(</span><span class="nv">$return</span><span class="o">,</span> <span class="nv">$var</span><span class="o">,</span> <span class="n">space</span><span class="p">);</span> </span><span id="L-21"><a name="L-21"></a> <span class="p">}</span> </span><span id="L-22"><a name="L-22"></a> <span class="p">}</span> </span><span id="L-23"><a name="L-23"></a> </span><span id="L-24"><a name="L-24"></a> <span class="k">@return</span> <span class="err">$</span><span class="nt">return</span><span class="o">;</span> </span><span id="L-25"><a name="L-25"></a><span class="p">}</span> </span><span id="L-26"><a name="L-26"></a> </span><span id="L-27"><a name="L-27"></a><span class="cm">/*</span> </span><span id="L-28"><a name="L-28"></a><span class="cm"> * Output a selector with px fallback and rem values, so that modern browsers will use the rem values.</span> </span><span id="L-29"><a name="L-29"></a><span class="cm"> * Both multiple selectors and multiple sizes in multiple units can be provided.</span> </span><span id="L-30"><a name="L-30"></a><span class="cm"> *</span> </span><span id="L-31"><a name="L-31"></a><span class="cm"> * Usage example:</span> </span><span id="L-32"><a name="L-32"></a><span class="cm"> * </span> </span><span id="L-33"><a name="L-33"></a><span class="cm"> * .navbar {</span> </span><span id="L-34"><a name="L-34"></a><span class="cm"> * @include rem(height line-height, 48px); // multiple selectors</span> </span><span id="L-35"><a name="L-35"></a><span class="cm"> * @include rem(padding, 16px 8px 2% 0px); // multiple units, only px will be converted</span> </span><span id="L-36"><a name="L-36"></a><span class="cm"> * @include rem(border-bottom, rhythm(.5) solid red); // Rhythm: http://compass-style.org/reference/compass/typography/vertical_rhythm/</span> </span><span id="L-37"><a name="L-37"></a><span class="cm"> * }</span> </span><span id="L-38"><a name="L-38"></a><span class="cm"> *</span> </span><span id="L-39"><a name="L-39"></a><span class="cm"> * Produces:</span> </span><span id="L-40"><a name="L-40"></a><span class="cm"> * </span> </span><span id="L-41"><a name="L-41"></a><span class="cm"> * .navbar {</span> </span><span id="L-42"><a name="L-42"></a><span class="cm"> * height: 48px;</span> </span><span id="L-43"><a name="L-43"></a><span class="cm"> * height: 3rem; // given a font-size of 16px</span> </span><span id="L-44"><a name="L-44"></a><span class="cm"> * line-height: 48px;</span> </span><span id="L-45"><a name="L-45"></a><span class="cm"> * line-height: 3 rem;</span> </span><span id="L-46"><a name="L-46"></a><span class="cm"> * padding: 16px 8px 2% 0;</span> </span><span id="L-47"><a name="L-47"></a><span class="cm"> * padding: 1rem 0.5rem 2% 0;</span> </span><span id="L-48"><a name="L-48"></a><span class="cm"> * border-bottom: 12px solid red;</span> </span><span id="L-49"><a name="L-49"></a><span class="cm"> * border-bottom: 0.75rem solid red;</span> </span><span id="L-50"><a name="L-50"></a><span class="cm"> * }</span> </span><span id="L-51"><a name="L-51"></a><span class="cm"> */</span> </span><span id="L-52"><a name="L-52"></a><span class="k">@mixin</span><span class="nf"> rem</span><span class="p">(</span><span class="nv">$selectors</span><span class="o">,</span> <span class="nv">$size</span><span class="p">)</span> <span class="p">{</span> </span><span id="L-53"><a name="L-53"></a> <span class="k">@each</span> <span class="err">$</span><span class="nt">selector</span> <span class="nt">in</span> <span class="err">$</span><span class="nt">selectors</span> <span class="p">{</span> </span><span id="L-54"><a name="L-54"></a> <span class="k">@if</span> <span class="nv">$legacy-support-for-ie</span> <span class="p">{</span> </span><span id="L-55"><a name="L-55"></a> <span class="nn">#</span><span class="p">{</span><span class="err">$</span><span class="nt">selector</span><span class="p">}</span><span class="nd">:</span> <span class="err">$</span><span class="nt">size</span><span class="o">;</span> </span><span id="L-56"><a name="L-56"></a> <span class="p">}</span> </span><span id="L-57"><a name="L-57"></a> <span class="nn">#</span><span class="p">{</span><span class="err">$</span><span class="nt">selector</span><span class="p">}</span><span class="nd">:</span> <span class="nt">px-to-rem</span><span class="o">(</span><span class="err">$</span><span class="nt">size</span><span class="o">);</span> </span><span id="L-58"><a name="L-58"></a> <span class="p">}</span> </span><span id="L-59"><a name="L-59"></a><span class="p">}</span> </span></pre></div> </td></tr></table>
"root em", px, rem