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chromium/third_party/blink/web_tests/external/wpt/css/cssom/insertRule-import-trailing-garbage-crash.html 

<!doctype html>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1914106">
<style></style>
<script>
document.querySelector("style").sheet.insertRule("@import url('data:text/css,:root{background:red}');html,body{/* random garbage */}");
</script>