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Test Info:
- Manifest: dom/base/crashtests/crashtests.list
<script>
addEventListener("DOMContentLoaded", () => {
a.ownerDocument.designMode = "on"
document.execCommand("selectAll", false, null)
document.execCommand("superscript", false, null)
})
</script>
<s>
<h2>
<marquee id="a">