third_party/blink/web_tests/css3/filters/effect-reference-source-alpha-hw.html

<svg xmlns="http://www.w3.org/2000/svg" width="0" height="0" version="1.1">
  <defs>
    <filter id="alpha" color-interpolation-filters="sRGB">
      <feColorMatrix in="SourceAlpha"/>
    </filter>
  </defs>
</svg>
<style>
.rect {
    background-color: red;
    width: 100px;
    height: 100px;
    filter: url(#alpha);
    transform: translateZ(0);
}
</style>
<div class="rect"></div>