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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
"use strict";
addEventListener("DOMContentLoaded", () => {
document.documentElement.contentEditable = "plaintext-only";
document.execCommand("delete");
}, {once: true});
</script>
</head>
<body>
<track></track>
</body>
</html>