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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
document.addEventListener("DOMContentLoaded", () => {
const element_0 = document.createElement("s");
const element_1 = document.createElement("a");
const element_2 = document.createElement("l");
element_2.setAttribute("contenteditable", "true");
element_1.appendChild(element_2);
element_0.appendChild(element_1);
document.documentElement.appendChild(element_0);
document.designMode = "on";
document.execCommand("insertLineBreak");
});
</script>
</head>
<body><!-- COMMENT --></body>
</html>