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Test Info:
<script>
function onError() {
document.querySelector("details").appendChild(
document.querySelector("p")
);
document.execCommand("indent");
}
function onLoadOfStyle() {
document.execCommand("delete");
document.querySelector("details").contentEditable = "true";
// For emulating the traditional behavior, collapse Selection to end of the
// text node at end of the <style> (end of the text node after the comment
// node).
const style = document.querySelector("style");
getSelection().collapse(style.lastChild, style.lastChild.length);
document.querySelector("input").select();
}
</script>
<video focus="false">
<source onerror="onError()">
</video>
<details open>
<p>
<input contenteditable="false">
<style onload="onLoadOfStyle()">
<!-- x -->
</style></p></details></body>