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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml"><head><script>
<![CDATA[
function onLoad() {
// For emulating the traditional behavior, collapse Selection to end of the
// text node in the <textarea> which is the deepest last child of the <body>.
const textarea = document.querySelector("textarea");
getSelection().collapse(textarea.lastChild, textarea.lastChild.length);
document.execCommand("selectAll");
document.execCommand("selectAll");
document.execCommand("inserthtml", false, "<span><div>");
const span = document.createElementNS("http://www.w3.org/1999/xhtml", "span");
textarea.appendChild(span);
}
]]>
</script></head><div contenteditable="true"></div><body onload="onLoad();"><textarea>f</textarea></body></html>