Add support for UIA accessibility landmarks

[AgneLukoseviciute]

This adds a prop called accessibilityLandmarkType to View. This prop will wire to UIA LandmarkTypeProperty() and when used will allow for faster navigation & skimming by users interacting through a screen reader.

• Closes: [Accessibility] Add support for landmarks #8452

Microsoft Reviewers: Open in CodeFlow

[asklar]

I see the referenced issue talks about Headings in addition to landmarks, but this PR only adds the latter. Are you planning on adding headings as well, or is that tracked by a separate PR/issue?

[AgneLukoseviciute]

I see the referenced issue talks about Headings in addition to landmarks, but this PR only adds the latter. Are you planning on adding headings as well, or is that tracked by a separate PR/issue?

That was done separately a few weeks ago as it was a bit more urgent. (#8516)

[asklar]

I see the referenced issue talks about Headings in addition to landmarks, but this PR only adds the latter. Are you planning on adding headings as well, or is that tracked by a separate PR/issue?

That was done separately a few weeks ago as it was a bit more urgent. (#8516)

thanks @AgneLukoseviciute - could you also document that API then?

[AgneLukoseviciute]

I see the referenced issue talks about Headings in addition to landmarks, but this PR only adds the latter. Are you planning on adding headings as well, or is that tracked by a separate PR/issue?

That was done separately a few weeks ago as it was a bit more urgent. (#8516)

thanks @AgneLukoseviciute - could you also document that API then?

Since that one didn't require a windows-specific prop, there wasn't a change to the API. Text now sets the heading level automatically whenever accessibilityRole="header" is specified to match RN-core, so I think we might be ok not documenting that as it was more of a bug fix.

[acoates-ms]

Can we take a look at https://github.com/react-native-community/discussions-and-proposals/blob/fd64774e8161973b87b8f0a27587fa039eb7b43b/proposals/0000-accessibility-apis.md and see where this might fit in. Is there a gap in that proposal that we should be suggesting. Or should we be implementing this functionality in another way?

[AgneLukoseviciute]

Can we take a look at https://github.com/react-native-community/discussions-and-proposals/blob/fd64774e8161973b87b8f0a27587fa039eb7b43b/proposals/0000-accessibility-apis.md and see where this might fit in. Is there a gap in that proposal that we should be suggesting. Or should we be implementing this functionality in another way?

@acoates-ms Thanks for pointing this out! It looks like there is an ARIA equivalent for UIA landmarks, and the RFC seems to be proposing that we do this through accessibilityRole. I'm now thinking this would be a better approach if having windows-specific values for accessibilityRole is not an issue.

I'll keep this open as I draft moving the logic over to accessibilityRole.