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chromium/third_party/blink/web_tests/editing/execCommand/resources/reset-default-values-helper-2.html 

<!DOCTYPE html>
<script>
    window.parent.postMessage(JSON.stringify({
        DefaultParagraphSeparator: document.queryCommandValue("DefaultParagraphSeparator"),
        StyleWithCSS: document.queryCommandValue("StyleWithCSS")
    }), location.protocol + "//" + location.host);
</script>