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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
document.addEventListener("DOMContentLoaded", () => {
document.designMode = "on";
window.find("AA");
document.addEventListener(
"selectionchange",
onSelectionChangeOrDOMNodeInserted,
{once: true}
);
document.querySelector("output").addEventListener(
"DOMNodeInserted",
onSelectionChangeOrDOMNodeInserted
);
document.execCommand("forwarddelete");
});
function onSelectionChangeOrDOMNodeInserted() {
document.execCommand("delete");
document.querySelector("output").value = "";
}
</script>
</head>
<body>
<output>
<ruby></ruby>
<div>
AAA
</div></output></body>
</html>