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chromium
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chromium/third_party/blink/web_tests/editing/execCommand/resources/reset-default-values-helper-1.html 

<!DOCTYPE html>
<script>
    document.execCommand("DefaultParagraphSeparator", false, "p");
    document.execCommand("StyleWithCSS", false, true);
    location.href = "reset-default-values-helper-2.html";
</script>