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Test Info:

<!DOCTYPE html>
<title>Synchronous script element still blocks rendering after removing `blocking=render`</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/test-render-blocking.js"></script>
// Test script must be added before the synchronous script because the
// synchronous script is parser-blocking.
promise_setup(async () => {
let script = await nodeInserted(document.head, node => === 'script');
script.blocking = '';
// Also inserts some contents for non-compliant UA to render
document.body = document.createElement('body');
document.body.appendChild(document.createTextNode('Some text'));
() => assert_equals(window.dummy, 1),
'Render-blocking script is loaded and evaluated');
<script id="script" blocking="render" src="support/dummy-1.js?pipe=trickle(d1)"></script>