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chromium/third_party/blink/web_tests/fast/forms/accent-color/accent-color-no-transparency.html 

<!DOCTYPE html>
<link rel=author title="Joey Arhar" href="mailto:[email protected]">
<link rel=help href="https://bugs.chromium.org/p/chromium/issues/detail?id=1200932">
<link rel=match href="accent-color-no-transparency-expected.html">

<p>The alpha component of accent-color should be ignored, and the form control
should be drawn as if alpha fully opaque.</p>

<div>
  <input checked type=checkbox style="accent-color:rgba(255, 0, 0, 0.5)">
</div>

<div>
  <input checked type=radio style="accent-color:rgba(255, 0, 0, 0.5)">
</div>

<div>
  <input type=range style="accent-color:rgba(255, 0, 0, 0.5)">
</div>

<div>
  <progress style="accent-color:rgba(255, 0, 0, 0.5)" max="100" value="50"> 50% </progress>
</div>