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Test Info:
<script>↩
function onLoad() {↩
const shadow = document.querySelector("shadow");↩
// For emulating the traditional behavior, collapse Selection to end of the↩
// <shadow> which is the deepest last child of the <body>.↩
getSelection().collapse(shadow, shadow.childNodes.length);↩
try {↩
document.querySelector("dd[contenteditable]").addEventListener(↩
"DOMNodeInserted",↩
() => {↩
try {↩
shadow.replaceWith("1");↩
} catch(e) {}↩
}↩
);↩
} catch(e) {}↩
try {↩
document.execCommand("justifyFull");↩
} catch(e) {}↩
}↩
</script>↩
<body onload="onLoad();">↩
<dd contenteditable>↩
<shadow></body>↩