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

<!DOCTYPE html>
<title>Parser-inserted defer 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 id="defer-script" defer blocking="render"
        src="support/dummy-1.js?pipe=trickle(d1)">
</script>

<div>Some text</div>

<script>
const deferScript = document.getElementById('defer-script');
test_render_blocking(
    deferScript,
    () => assert_equals(window.dummy, 1),
    'Parser-inserted render-blocking defer script is evaluated');
</script>