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chromium/third_party/blink/web_tests/fast/css/empty-first-line-crash.html 

<!DOCTYPE html>
<script>
if (window.testRunner)
    testRunner.dumpAsText();
</script>
<style>
*:empty:first-line { background: red; }
</style>
<div>
Tests that the :empty pseudo-class doesn't cause a crash when the empty status changes during parsing.
<button autofocus></button>
</div>