inherit-background-color-transition.html

<!DOCTYPE html>
<html id="html" class="reftest-wait">
  <title>Verifies that 'background-color' from a transition inherits explicitly down if requested</title>
  <link rel="help" href="https://crbug.com/1325340">
  <link rel="match" href="inherit-background-color-transition-ref.html">
  <script src="support/helper.js"></script>
  <style>
    body { transition: background-color 1s; color: white; background-color: black; }
    .light { color: black; background-color: white; }
  </style>
</head>
<body id="body">
  <div style="background-color: inherit">
    <div style="background-color: inherit">PASS if black on white</div>
  </div>
  <script>
    body.offsetTop;

    async function run() {
      let transitionEnd = new Promise((resolve) => {
        body.addEventListener('transitionend', resolve);
      });

      // Trigger transition:
      body.classList.toggle('light');

      const transition = body.getAnimations()[0];
      await transition.ready;
      await waitForFrame();

      // Expedite transition, but let it finish naturally.
      transition.currentTime = transition.effect.getTiming().duration - 1;
      await transitionEnd;

      await waitForFrame();
    }

    run().then(() => html.classList.toggle('reftest-wait'));
  </script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-transitions/inherit-background-color-transition.html