custom-highlight-dynamic-container-metrics-001.html

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="UTF-8">
<title>CSS Highlight API Test: Highlights using container sizes update on container changes</title>
<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
<link rel="help" href="https://drafts.csswg.org/css-pseudo/#highlight-styling">
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#container-lengths">
<link rel="match" href="custom-highlight-dynamic-container-metrics-001-ref.html">
<meta name="assert" value="lengths depending on containers take the correct values in a universal highlight with no container when the container size changes">
<script src="/common/reftest-wait.js"></script>
<head>
  <style>
    iframe {
      width: 200px;
      height: 100px;
    }

    iframe.resize {
      width: 400px;
      height: 200px;
    }
</style>
</head>
<iframe id="iframe" src="resources/iframe-container.html"></iframe>
<script>
  function runtest() {
    iframe.classList.add('resize');
    requestAnimationFrame(() => takeScreenshot());
  }
  iframe.onload = runtest;
</script>
</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-highlight-api/painting/custom-highlight-dynamic-container-metrics-001.html