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Test Info:

<style>
* { position: absolute; }
</style>
<script>
function jsfuzzer() {
del1.addEventListener("DOMSubtreeModified", () => {
document.execCommand("italic", false);
document.execCommand("selectAll", false);
});
a1.replaceChild(iframe1, a1.childNodes[0]);
}
</script>
<body onload=jsfuzzer()>
<a contenteditable="" id="a1">
<del id="del1">
<iframe id="iframe1">