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chromium/third_party/blink/web_tests/external/wpt/html/dom/render-blocking/script-inserted-module-script.html 

<!DOCTYPE html>
<title>Script-inserted module script elements with "blocking=render" are render-blocking</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/test-render-blocking.js"></script>

<script>
const moduleScript = document.createElement('script');
moduleScript.type = 'module';
moduleScript.blocking = 'render';
moduleScript.src = 'support/dummy-1.mjs?pipe=trickle(d1)';
document.head.appendChild(moduleScript);
</script>

<div id="dummy">some text</div>

<script>
test_render_blocking(
    moduleScript,
    () => assert_equals(document.getElementById('dummy').textContent, '1'),
    'Script-inserted render-blocking module script is evaluated');
</script>