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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - REGRESSION: Applying ::before to a pseudo-element no longer works"
   href="https://bugs.webkit.org/show_bug.cgi?id=166946#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - REGRESSION: Applying ::before to a pseudo-element no longer works"
   href="https://bugs.webkit.org/show_bug.cgi?id=166946">bug 166946</a>
              from <span class="vcard"><a class="email" href="mailto:dcrousso+webkit&#64;gmail.com" title="Devin Rousso &lt;dcrousso+webkit&#64;gmail.com&gt;"> <span class="fn">Devin Rousso</span></a>
</span></b>
        <pre>Created <span class=""><a href="attachment.cgi?id=298637" name="attach_298637" title="[HTML] Reduction">attachment 298637</a> <a href="attachment.cgi?id=298637&amp;action=edit" title="[HTML] Reduction">[details]</a></span>
[HTML] Reduction

Notice that the color &quot;green&quot; never appears.

&lt;style&gt;
    input {
        -webkit-appearance: none;
    }
    input::-webkit-slider-runnable-track {
        background-color: red;
        height: 1px;
    }
    input::-webkit-slider-runnable-track::before {
        display: block;
        height: 10px;
        content: &quot;&quot;;
        background-color: green;
    }
&lt;/style&gt;
&lt;input type=&quot;range&quot;&gt;</pre>
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