1974383 - Implement `headingoffset` attribute

Status: ASSIGNED

(Core :: DOM: Core & HTML, enhancement)

Description

[Keith Cirkel [:keithamus]]

This is a tracking issue for implementing the proposed headingoffset attribute as discussed in https://github.com/whatwg/html/issues/5033. There is a draft spec: https://github.com/whatwg/html/pull/11086

Comment 1

[James Teh [:Jamie]]

Just a heads up that this will require accessibility engine changes at multiple layers. The most obvious place is here. However, because this method is in the Accessible base class and must thus work for both local and remote Accessibles, some mechanism will need to be added to get the offset, and that will need to be pushed from content to parent and included in the RemoteAccessible cache.

Comment 2

[Keith Cirkel [:keithamus]]

(In reply to James Teh [:Jamie] from comment #1)

Just a heads up that this will require accessibility engine changes at multiple layers. The most obvious place is here. However, because this method is in the Accessible base class and must thus work for both local and remote Accessibles, some mechanism will need to be added to get the offset, and that will need to be pushed from content to parent and included in the RemoteAccessible cache.

Thanks for this! For RemoteAccessible I was looking to put the level as a CacheKey of mCachedFields, but I am happy to take suggestions for alternative/better ways to handle this.

Comment 3

[Keith Cirkel [:keithamus]]

Attachment: WIP: WIP! Bug 1974383 - Implement headingoffset