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Test Info:
- Manifest: dom/html/crashtests/crashtests.list
<script>
window.onload = () => {
window[0].focus()
a.close()
a.showModal()
document.execCommand("selectAll", false)
}
function go() {
document.onselectstart = document.createElement("frameset").onload
}
</script>
<details open="true" ontoggle="go()">a</details>
<iframe></iframe>
<dialog id="a" tabindex="3">a</dialog>