Add command & commandfor attribute related mappings

[keithamus]

This adds the mapping for command and commandfor attributes as per the Invokers Explainer.

Additions:

• 3.5.21 button (command attribute in the Toggle popover state)
• 3.5.22 button (command attribute in the Show popover state)
• 3.5.23 button (command attribute in the Hide popover state)
• 3.5.24 button (command attribute in the Close state)
• 3.5.25 button (command attribute in the Show modal state)

Test, Documentation and Implementation tracking

Once this PR has been reviewed and has consensus from the working group, tests should be written and issues should be opened on browsers. Add N/A and check when not applicable.

• "author MUST" tests:
• "user agent MUST" tests:
• Browser implementations (link to issue or commit):
  • WebKit:
  • Gecko:
  • Blink:
• Does this need AT implementations?
• Related APG Issue/PR:
• MDN Issue/PR:

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[scottaohara]

feel free to reach out if you have questions / want to talk through what i was suggesting

[keithamus]

Okay @scottaohara I've expanded it as you described, I think it makes a lot more sense. Now each state has its own table which prescibes how that state should map. I've included all currently specified states, toggle/show/hide popover, close, and show modal.

[scottaohara]

ok i think this can work.

we still need attribute tables for command and command for. but as far as i'm concerned, those attribute tables could be simplified to just list the attribute, and point to the instances you made in the element section.

e.g., like how the type attribute for inputs is listed - but simpler... i could see that just removing all the individual mapping rows and in the comments, just link to the first of the button (command in the x state) tables you made.

(mental note to reduce redundancy and unnecessary page link by squashing all "not mapped" or "see ..." rows into a single comment row for other attributes too...)