parser-blocking-stylesheet-001.html

<!doctype html>
<html>
<head>
  <title>Parser blocking stylesheet in body</title>
  <link rel="help" href="https://github.com/chrishtr/rendering/blob/master/stylesheet-loading-proposal.md">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>
<body>
  <script>
    async_test(t => {
      t.step_timeout(() => {
        assert_equals(document.querySelector("#after-sheet"), null, "#after-sheet element should not have been inserted into the DOM.");
        t.done();
      }, 100);
    }, "setTimeout() triggered while the stylesheet is loading.");
  </script>
  <link rel="stylesheet" href="support/empty.css?pipe=trickle(d1)">
  <div id="after-sheet"></div>
</body>
</html>

chromium/third_party/blink/web_tests/wpt_internal/html/semantics/parser-blocking-stylesheets/parser-blocking-stylesheet-001.html