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Test Info:
<html>
<head>
<script>
function onLoad() {
// For emulating the traditional behavior, collapse Selection to end of the
// last text node of the <body> (end of the text node after the <p hidden>).
getSelection().collapse(
document.body.lastChild,
document.body.lastChild.length
);
getSelection().setPosition(
document.querySelector("hr"),
0
);
document.execCommand("delete");
}
</script>
<body onload="onLoad()">
<p hidden>
<canvas contenteditable>
<hr contenteditable>
3uW4*</hr></canvas>
</p>
</body>
</html>