1827317 - [wpt-sync] Sync PR 39462 - [GridNG] Enforce that IFC's disable subgrid layout

Status: RESOLVED FIXED

(Core :: Layout: Grid, task, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 39462 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/39462
Details from upstream follow.

Kurt Catti-Schmidt (SCHMIDT) <[e-mail]> wrote:

[GridNG] Enforce that IFC's disable subgrid layout

The spec[1] states that items that establish an independent formatting
context (IFC's) are not eligible for subgrid layout. This CL enforces
that behavior and gets the 'independent-formatting-context.html' test
to pass.

Some subtlety was needed to specifically check for layout and paint
containment, as the other types of containment do not establish IFC's.

'independent-formatting-context.html' was updated to have all values
of contain, including the composite values.

1. https://drafts.csswg.org/css-grid-2/#subgrid-listing

Bug: 618969
Change-Id: I642647b7f2ccbd1fc1cf9e59f70eb786869eb363
Reviewed-on: https://chromium-review.googlesource.com/4412028
WPT-Export-Revision: 8fb797598b2a706eb76f5bfa83af15f4c420a959

Comment 1

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Pushed to try (stability) https://treeherder.mozilla.org/#/jobs?repo=try&revision=254dba7fce06c0bda916d0bb686a100721a2d9d9

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/12b15ab8a81b
[wpt PR 39462] - [GridNG] Enforce that IFC's disable subgrid layout, a=testonly

Comment 3

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Test result changes from PR not available.

Comment 4

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/12b15ab8a81b