Editorial: [html-aam] Add <abbr title="..."> platform a11y API mappings

[rahimabdi]

Closes w3c/html-aam#591

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[rahimabdi]

@spectranaut @benbeaudry Could you please help me document the appropriate Microsoft/ATK native accessibility APIs for this PR?

CC @scottaohara

[spectranaut]

Hi Rahim... reading through the issue I'm not totally sure what the goal is here. I guess from cookiecrook's comments we want the title to be exposed somehow, but not not immediately and by default, in some kind of AXHelp-style way?

[spectranaut]

discussed during triage: https://www.w3.org/2025/09/11-aria-minutes.html#fcf8

but might need more discussion! @rahimabdi feel free to add "agenda" if you feel like we need to discuss more

[rahimabdi]

Thanks @spectranaut.

Open questions:

• Should spec discourage authors from using title attribute with <abbr>? If yes, where should this be documented?
• Per @mcking65, how should guidance be written in AAMs when specifying an AT behavior (e.g., "on demand" announcements)? Is this out of scope for html-aam?

[spectranaut]

Discussed in today's meeting: https://www.w3.org/2025/09/18-aria-minutes.html#c804