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chromium/third_party/blink/web_tests/external/wpt/html/rendering/widgets/appearance/appearance-transition-002.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>compute the kind of widget: transition origin without author origin style before the transition</title>
<link rel="match" href="appearance-transition-002-ref.html">
<style>
  input {
    transition: background-color 1e10s steps(2, start);
  }

  .bg200 {
    background-color: rgb(0, 200, 0);
  }
</style>
<input value="text" id=input>
<script>
  document.documentElement.offsetTop;
  input.classList.toggle('bg200');
</script>
<p>PASS if the input field has a light green background</p>