dynamic-render-blocking-style-element-does-not-block-script.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/document-metadata/interactions-of-styling-and-scripting/dynamic-render-blocking-style-element-does-not-block-script.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Script-created render-blocking style element is not script-blocking</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="support/utils.js"></script>

<script>

const style = document.createElement('style');

const sheet = document.createTextNode('@import url(stylesheet.py?delay=1);');

style.appendChild(sheet);

style.blocking = 'render';

document.head.appendChild(style);

</script>

<h1>Some text</h1>

<script>

test(() => {

  assert_false(styleExists("h1 { color: purple; }"),

               'stylesheet should still be pending');

  const h1 = document.querySelector('h1');

  assert_equals(getComputedStyle(h1).color, 'rgb(0, 0, 0)');

});

</script>