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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
addEventListener("load", () => {
const dialog = document.querySelector("dialog");
dialog.showModal();
dialog.close();
document.execCommand("justifyLeft");
document.execCommand("delete");
});
</script>
</head>
<body><dialog contenteditable>
</dialog></body>
</html>