1986602 - [meta] Handle anchor scopes in shadow trees

Status: RESOLVED FIXED

(Core :: Layout: Positioned, task)

Description

[Jari Jalkanen [:jari]]

Per spec, anchor scope 'all' and the list of names for an 'ident' anchor scope are tree-scoped and should only affect names in the same tree. The workings of tree-scope names can be modified with with ::part, ::slotted and :host rules.

Ideal solution would involve knowing from which style sheet a value comes from and to which tree it should apply to, however in many practically relevant use cases it is possible to tell whether an anchor scope does not apply just by checking the element properties.

Comment 1

[Jari Jalkanen [:jari]]

Attachment: Bug 1986602: Check if anchor scope is relevant in shadow tree. r=#anchor-positioning-reviewers

Comment 2

[Jari Jalkanen [:jari]]

Attachment: Bug 1986602: Update wpt tests depending on tree-scoped names. r=#anchor-positioning-reviewers

Comment 3

[Jari Jalkanen [:jari]]

This is m2 but the estimation is missing, and also the strategy: do we want to do a partial solution now or a proper solution later?

Comment 4

[David Shin[:dshin]]

Jari, we should talk about this bug in context of bug 1987926 - I expect the test outcomes that in-progress reviews have to change.

Comment 5

[Jari Jalkanen [:jari]]

The prerequisites for a proper solution to this bug are expected to be ready after bug 1988038 is implemented.

Comment 6

[Jonathan Watt [:jwatt]]

I'm making this block bug 1838746 directly since I want to clean up our dependency tree, including closing meta bugs, but I don't want this bug to drop out of the tree.