chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/background-clip/clip-text-animated-text.html

<!doctype html>
<html class="reftest-wait">
<title>CSS Test: background-clip: text animated text</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-4/#valdef-background-clip-text">
<link rel="author" href="mailto:[email protected]" title="Nathan Knowler">
<link rel="match" href="clip-text-animated-text-ref.html">
<style>
  .text {
    background-color: DeepPink;
    background-clip: text;
    font-size: 50px;
    font-family: sans-serif;
    font-weight: 600;
    color: transparent;
  }

  .text p {
    animation: fade-in 0.1s both;
  }

  @keyframes fade-in {
    from { opacity: 0; }
  }
</style>
<div class="text">
  <p>Text</p>
</div>
<script>
  const [animation] = document.querySelector(".text p").getAnimations();
  animation.finished.then(() => {
    document.documentElement.classList.remove("reftest-wait");
  });
</script>