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chromium/third_party/blink/web_tests/wpt_internal/css/css-pseudo/spelling-error-006-notref.html 

<!doctype html><meta charset="utf-8">
<title>CSS Pseudo-Elements Test: spelling error with originating decorations</title>
<link rel="author" name="Delan Azabani" href="mailto:[email protected]">
<body contenteditable spellcheck>quikc
<script>
    const range = new Range;
    range.setStart(document.body.firstChild, 0);
    range.setEnd(document.body.firstChild, 5);
    internals.setMarker(document, range, "spelling");
</script>