[Webkit-unassigned] [Bug 258282] REGRESSION (264594 at main): Broke custom element built-in polyfill by making form properties non deletable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258282

--- Comment #18 from Chris Dumez <cdumez at apple.com> ---
How important is a quirk here? Presumably, sites that include the script like so will get the new fixed version of the polyfill already:
```
<script src="//unpkg.com/@ungap/custom-elements"></script>
```

How concerned are we about pages including an explicit version of the polyfill that wouldn't have the fix?

What would be the best way to detect such pages?

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