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chromium/third_party/blink/web_tests/external/wpt/html/dom/render-blocking/element-render-blocking-025.html 

<!DOCTYPE html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/utils.js"></script>
<title>Adding an id to parsed element satisfies render block</title>

<link rel=expect href="#first" blocking="render">
<script>
async_test((t) => {
  requestAnimationFrame(() => {
    t.step(() => assert_true(!!document.getElementById("first")));
    t.step(() => assert_false(!!document.getElementById("last")));
    t.done();
  });
}, "adding an id in the body satisfies render block");
</script>
</head>
<body>
  <div id="willbefirst"></div>
  <script>
    willbefirst.id = "first";
          generateParserDelay();
  </script>
  <div id="second"></div>
  <script>
          generateParserDelay();
  </script>
  <div id="third"></div>
  <script>
          generateParserDelay();
  </script>
  <div id="fourth"></div>
  <script>
          generateParserDelay();
  </script>
  <div id="last"></div>
</body>