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Test Info:
<script>
let th;
function onLoad() {
// For emulating the traditional behavior, collapse Selection to end of the
// <colgroup> which is the last child of the <body>.
getSelection().collapse(
document.querySelector("colgroup"),
document.querySelector("colgroup").childNodes.length
);
th = document.querySelector("th"); // Cache the target for removing the event handler.
try {
th.addEventListener("DOMSubtreeModified", onDOMSubtreeModified);
} catch(e) {}
try {
th.align = "";
} catch(e) {}
}
let count = 0;
function onDOMSubtreeModified() {
if (count++ == 1) {
// If we didn't stop testing this, this event handler would be called too
// many times. It's enough to run twice to reproduce the bug report.
th.removeEventListener("DOMSubtreeModified", onDOMSubtreeModified);
}
try {
document.execCommand("selectAll");
} catch(e) {}
try {
document.execCommand("justifyCenter");
} catch(e) {}
try {
document.execCommand("forwardDelete");
} catch(e) {}
}
</script>
<body onload="onLoad()">
<table contenteditable>
<th></th>
<colgroup></body>