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Test Info:

<script>
function func_a() {
a.appendChild(b)
document.execCommand("indent", false)
}
function func_b() {
document.execCommand("delete", false)
a.contentEditable = "true"
c.select()
}
</script>
<video focus="false">
<source onerror="func_a()">
</video>
<details id="a" open="tru">
<p id="b">
<input id="c" contenteditable="pla">
<style onload="func_b()">
<!-- x -->