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Test Info:

<!DOCTYPE html>
<title>Parser-inserted style 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 style element because the style
// element is script-blocking.
promise_setup(async () => {
let sheet = await nodeInserted(document.head, node => === 'sheet');
sheet.blocking = '';
() => {
let color = getComputedStyle(document.querySelector('.target')).color;
assert_equals(color, 'rgb(255, 0, 0)');
'Render-blocking stylesheet is applied');
<style id="sheet" blocking="render">
@import url("support/target-red.css?pipe=trickle(d1)");
<div class="target">Some text</div>