`Modal` widget

[nexushoratio]

Likely just a renaming of the Info widget, though with more intent.

• [x] #190
• [x] #191
• [ ] ARIA roles to keep in mind
  • [x] Modal
  • [x] Base implementation
  • [x] aria-labelledby (element id) OR aria-label (text)
  • [x] aria-describedby (element id) (via documentation)
  • [ ] trap TAB https://github.com/nexushoratio/userscripts/issues/194#issuecomment-1826833900
  • [x] Should the API require header with label stuff and a close button, or let that come with later content? Maybe fail build() and/or show() if not present?
  • [x] Address this: If a variable holding a widget is set to a new value, the previous widget should be explicitly destroyed.

[nexushoratio]

From \<dialog> on MDN:

The \<dialog> element is exposed by browsers in a manner similar to custom dialogs that use the ARIA role="dialog" attribute.

elements invoked by the showModal() method implicitly have aria-modal="true",

[nexushoratio]

Not sure how to capture the TAB key. Mostly because of wanting to make sure it is compatible with VM.shortcut

Putting this on the back burner for now.