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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<script>
document.addEventListener("DOMContentLoaded", () => {
document.getElementById("id_0").contentEditable = false;
document.querySelector("[contenteditable]").focus();
document.execCommand("insertLineBreak");
})
</script>
<pre>
<ins id="id_0">
<map contenteditable>