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Test Info:
<script>
function onError() {
// For emulating the traditional behavior, collapse Selection to end of the
// text node in the <dl> which is the last deepest child of the <body>.
const dl = document.querySelector("dl");
getSelection().collapse(dl.lastChild, dl.lastChild.length);
getSelection().selectAllChildren(
document.querySelector("img")
);
document.execCommand("insertUnorderedList");
document.execCommand("enableObjectResizing");
}
</script>
<dd contenteditable="true">
<audio src="data:text/html,foo" onerror="onError()">
<img></img>
<dl>
</dl></audio><dd></body>