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rgba Less mixin

/***************************
 RGBA Background Colours
***************************/

.rgba(@r, @g, @b, @alpha) {
    @colour: rgb(@r, @g, @b);
    @alphaColour: hsla(hue(@colour), saturation(@colour), lightness(@colour), @alpha);
    @alphaColour: rgba(@r, @g, @b, @alpha);
    @ieAlphaColour: argb(@alphaColour);
    
    background-color: @colour; // Fallback for older browsers
    // This will be ignored by browsers that don't support it.
    background-color: @alphaColour;
    
    // OldIE hacks
    .lt-ie9 & { //assumes you have conditional commented <html> tags
        zoom: 1; // hasLayout
        background-color: transparent;
        -ms-filter:  "progid:DXImageTransform.Microsoft.gradient([email protected]{ieAlphaColour}, [email protected]{ieAlphaColour})"; // IE 8+
        filter: ~"progid:DXImageTransform.Microsoft.gradient([email protected]{ieAlphaColour}, [email protected]{ieAlphaColour})"; // IE 6 & 7
    }
    
}

Description

A mixin to facilitate cross-browser alpha background colours
https://snipt.net/embed/f3c328cf4d72be7d4ed71fec873413bc/
/raw/f3c328cf4d72be7d4ed71fec873413bc/
f3c328cf4d72be7d4ed71fec873413bc
scss
SCSS
24
2019-06-16T08:43:08
True
False
False
Feb 23, 2013 at 04:11 AM
/api/public/snipt/56264/
rgba-less-mixin
<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></pre></div></td><td class="code"><div class="highlight"><pre><span></span><span id="L-1"><a name="L-1"></a><span class="cm">/***************************</span> </span><span id="L-2"><a name="L-2"></a><span class="cm"> RGBA Background Colours</span> </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><span id="L-5"><a name="L-5"></a><span class="nc">.rgba</span><span class="o">(@</span><span class="nt">r</span><span class="o">,</span> <span class="o">@</span><span class="nt">g</span><span class="o">,</span> <span class="o">@</span><span class="nt">b</span><span class="o">,</span> <span class="o">@</span><span class="nt">alpha</span><span class="o">)</span> <span class="p">{</span> </span><span id="L-6"><a name="L-6"></a> <span class="k">@colour</span><span class="nd">:</span> <span class="nt">rgb</span><span class="o">(@</span><span class="nt">r</span><span class="o">,</span> <span class="o">@</span><span class="nt">g</span><span class="o">,</span> <span class="o">@</span><span class="nt">b</span><span class="o">);</span> </span><span id="L-7"><a name="L-7"></a> <span class="o">@</span><span class="nt">alphaColour</span><span class="nd">:</span> <span class="nt">hsla</span><span class="o">(</span><span class="nt">hue</span><span class="o">(@</span><span class="nt">colour</span><span class="o">),</span> <span class="nt">saturation</span><span class="o">(@</span><span class="nt">colour</span><span class="o">),</span> <span class="nt">lightness</span><span class="o">(@</span><span class="nt">colour</span><span class="o">),</span> <span class="o">@</span><span class="nt">alpha</span><span class="o">);</span> </span><span id="L-8"><a name="L-8"></a> <span class="o">@</span><span class="nt">alphaColour</span><span class="nd">:</span> <span class="nt">rgba</span><span class="o">(@</span><span class="nt">r</span><span class="o">,</span> <span class="o">@</span><span class="nt">g</span><span class="o">,</span> <span class="o">@</span><span class="nt">b</span><span class="o">,</span> <span class="o">@</span><span class="nt">alpha</span><span class="o">);</span> </span><span id="L-9"><a name="L-9"></a> <span class="o">@</span><span class="nt">ieAlphaColour</span><span class="nd">:</span> <span class="nt">argb</span><span class="o">(@</span><span class="nt">alphaColour</span><span class="o">);</span> </span><span id="L-10"><a name="L-10"></a> </span><span id="L-11"><a name="L-11"></a> <span class="nt">background-color</span><span class="nd">:</span> <span class="o">@</span><span class="nt">colour</span><span class="o">;</span> <span class="o">//</span> <span class="nt">Fallback</span> <span class="nt">for</span> <span class="nt">older</span> <span class="nt">browsers</span> </span><span id="L-12"><a name="L-12"></a> <span class="o">//</span> <span class="nt">This</span> <span class="nt">will</span> <span class="nt">be</span> <span class="nt">ignored</span> <span class="nt">by</span> <span class="nt">browsers</span> <span class="nt">that</span> <span class="nt">don</span><span class="s1">&#39;</span><span class="s2">t support it.</span> </span><span id="L-13"><a name="L-13"></a> <span class="nt">background-color</span><span class="nd">:</span> <span class="o">@</span><span class="nt">alphaColour</span><span class="o">;</span> </span><span id="L-14"><a name="L-14"></a> </span><span id="L-15"><a name="L-15"></a> <span class="o">//</span> <span class="nt">OldIE</span> <span class="nt">hacks</span> </span><span id="L-16"><a name="L-16"></a> <span class="nc">.lt-ie9</span> <span class="k">&amp;</span> <span class="p">{</span> <span class="c1">//assumes you have conditional commented &lt;html&gt; tags</span> </span><span id="L-17"><a name="L-17"></a> <span class="nt">zoom</span><span class="nd">:</span> <span class="nt">1</span><span class="o">;</span> <span class="o">//</span> <span class="nt">hasLayout</span> </span><span id="L-18"><a name="L-18"></a> <span class="nt">background-color</span><span class="nd">:</span> <span class="nt">transparent</span><span class="o">;</span> </span><span id="L-19"><a name="L-19"></a> <span class="nt">-ms-filter</span><span class="nd">:</span> <span class="s2">&quot;progid:DXImageTransform.Microsoft.gradient([email protected]{ieAlphaColour}, [email protected]{ieAlphaColour})&quot;</span><span class="o">;</span> <span class="o">//</span> <span class="nt">IE</span> <span class="nt">8</span><span class="o">+</span> </span><span id="L-20"><a name="L-20"></a> <span class="nt">filter</span><span class="nd">:</span> <span class="o">~</span><span class="s2">&quot;progid:DXImageTransform.Microsoft.gradient([email protected]{ieAlphaColour}, [email protected]{ieAlphaColour})&quot;</span><span class="o">;</span> <span class="o">//</span> <span class="nt">IE</span> <span class="nt">6</span> <span class="k">&amp;</span> <span class="nt">7</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><span id="L-23"><a name="L-23"></a><span class="p">}</span> </span></pre></div> </td></tr></table>
"cross browser", less, mixin, rgba