[Webkit-unassigned] [Bug 166946] REGRESSION: Applying ::before to a pseudo-element no longer works

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166946

--- Comment #3 from Devin Rousso <dcrousso+webkit at gmail.com> ---
Created attachment 298637
  --> https://bugs.webkit.org/attachment.cgi?id=298637&action=review
[HTML] Reduction

Notice that the color "green" never appears.

<style>
    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: "";
        background-color: green;
    }
</style>
<input type="range">

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