1358447 - Elements which do not support aria-checked="mixed" should not expose "checked" accessibility state

Status: RESOLVED FIXED

(Core :: Disability Access APIs, defect)

Description

[Joanmarie Diggs]

Steps to reproduce:
1. Load data:text/html,<div role="switch" aria-checked="mixed" tabindex="0">power</div>
2. Use Accerciser to examine the element

Expected results: the element would lack STATE_CHECKED
Actual results: the element has STATE_CHECKED

The ARIA spec states, "The aria-checked attribute of a switch indicates whether the input is on (true) or off (false). The mixed value is invalid, and user agents must treat a mixed value as equivalent to false for this role." See https://rawgit.com/w3c/aria/master/aria/aria.html#switch

Comment 1

[Joanmarie Diggs]

Updating the summary. The ARIA spec also states:

> The mixed value is not supported on radio, menuitemradio, switch or any element that inherits from these in the taxonomy, and user agents must treat a mixed value as equivalent to false for those roles.

See https://rawgit.com/w3c/aria/master/aria/aria.html#aria-checked.

Further testing shows that the "checked" accessibility state is also being exposed when aria-checked="mixed" is set on a radio or menuitemradio. In addition, this is also happening in Windows. (In macOS, I'm getting incorrect values, including for aria-checked="true", for non-native inputs. I'll look into that in a bit and either add it to this bug or open a new bug.)

Comment 2

[Joanmarie Diggs]

Attachment: proposed patch

Comment 3

[Marco Zehe (:MarcoZ)]

Comment on attachment 8883150 [details] [diff] [review]
proposed patch

Thanks! r=me.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/mozilla-inbound/rev/a48987725783
Elements which do not support aria-checked="mixed" should not expose "checked" accessibility state. r=marcoz

Comment 5

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

https://hg.mozilla.org/mozilla-central/rev/a48987725783