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Test Info:
<head contenteditable="true">
<script type="text/javascript">
<![CDATA[
function onLoad() {
getSelection().collapse(document.body, document.body.childNodes.length);
const r = document.createRange();
r.selectNode(document.body);
r.deleteContents();
try {
document.execCommand("selectAll");
} catch(e) {}
}
]]>
</script>
</head>
<body onload="onLoad();" contenteditable="true"></body>
</html>