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Test Info:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script>
document.addEventListener("DOMContentLoaded", () => {
const output = document.querySelector("output");
const table = document.querySelector("table");
table.addEventListener("DOMSubtreeModified", () => {
document.execCommand("bold");
document.execCommand("hiliteColor", false, "white");
output.appendChild(table);
document.execCommand("forwardDelete");
table.setAttribute("onwebkitsourceclose", "foo()");
document.execCommand("insertText", false, "a");
});
document.execCommand("selectAll");
table.insertRow();
});
</script>
</head>
<body>
<canvas contenteditable>
<output>
<table tabindex="0" autofocus></table>
</output>
</canvas>
</body>
</html>