Add closedby property on HtmlDialogTag

[8549]

Fixes #460.
Changelog:

• Added "closedby" property and allowed values on HtmlDialogTag interface to comply with HTML spec.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0b941c5

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[arthurfiorette]

@8549 can you please add a changelog?

[8549]

@arthurfiorette I added it to my previous comment. If you instead need a changeset as the bot suggested, I'll try to edit it in.