chromium/third_party/blink/web_tests/wpt_internal/css/css-pseudo/spelling-error-004-crash.html

<!doctype html><meta charset="utf-8">
<title>CSS Pseudo-Elements Test: spelling error with unusual root element</title>
<link rel="author" name="Delan Azabani" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#highlight-ua-styles">
<link rel="help" href="https://crbug.com/1359175">
<meta name="assert" value="Checks that spelling errors in an HTML document with the wrong root element (body) will not cause a crash, even if this means there are no longer any default UA styles.">
<body contenteditable spellcheck>quikc
<script>
    document.documentElement.replaceWith(document.body);
    const range = new Range;
    range.setStart(document.documentElement.firstChild, 0);
    range.setEnd(document.documentElement.firstChild, 5);
    internals.setMarker(document, range, "spelling");
</script>