[wp-trac] [WordPress Trac] #32600: wp.a11y.speak improvements

[WordPress Trac]

#32600: wp.a11y.speak improvements
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 Reporter:  afercia                    |      Owner:
     Type:  defect (bug)               |     Status:  new
 Priority:  normal                     |  Milestone:  Awaiting Review
Component:  General                    |    Version:  4.2
 Severity:  normal                     |   Keywords:
  Focuses:  accessibility, javascript  |
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 Now that `wp.a11y.speak()` is in core and we have some weeks of real usage
 experience, we'd like to propose a first round of possible improvements.
 We have a couple of things for now:

 1.
 Noticed [https://github.com/voldemortensen/menu-customizer/issues/77
 during the Menu Customizer development and testing], looks like sometimes
 the previous message gets announced before the current message.
 We couldn't consistently reproduce this so, technically, it's not a bug
 but [https://wordpress.slack.com/archives/accessibility/p1433787966000781
 we agreed in the last accessibility team meeting] to change the aria-
 relevant value from "all" to the default "additions text".
 Basically there's no point in getting also the "removals", at least in
 this WordPress implementation. Also, see for reference:
 http://www.w3.org/TR/wai-aria/states_and_properties#aria-relevant
 > Note: aria-relevant values of removals or all are to be used sparingly.
 Assistive technologies only need to be informed of content removal when
 its removal represents an important change, such as a buddy leaving a chat
 room.

 2.
 Add the ability to specify the politeness level of the live region. Looks
 like there's some interest in this feature initially reported by @drew and
 it would be a nice to have, also making `wp.a11y.speak()` a bit more
 flexible.
 For reference: http://www.w3.org/TR/wai-aria/states_and_properties#aria-
 live

 Also, any improvements proposal and feedback would be very welcome and
 appreciated.

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Ticket URL: <https://core.trac.wordpress.org/ticket/32600>
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