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Test Info:
<script>
function go() {
b.src = "x:"
b.requestFullscreen()
}
function fuzz() {
a.close("")
b.src = "x"
a.showModal()
a.appendChild(document.createElement("b"))
}
</script>
<body onload=go()>
<dialog id="a">
<nav>x</nav>
<video id="b" onerror="fuzz()"></video>