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chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/slider/slider-track-003.html 

<!doctype html>
<meta charset="utf-8">
<title>::slider-track customizes progress</title>
<link rel="author" href="mailto:[email protected]" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/4410#issuecomment-1720932781">
<link rel="mismatch" href="slider-track-003-notref.html">
<style>
  progress { appearance: none }
  ::slider-track {
    background: green;
  }
</style>
<progress value="0.5">