Sure, but dialog is only supported in Chrome, so in my opinion it's unreasonable to ship it without a polyfill.
I appreciate your argument, but I think it implies that you should always just create your own modal and not use the built-in one :)
Yes, in the current state of adoption, your polyfill is the only way to use the dialog element in production.
And if a developer uses React or Vue, he/she can easily overcome the polyfill's major limitation (stacking context) by using portals. ✌️
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