Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 75a2d3779951d3d18eb9fec609bf2f16c6274599
      
https://github.com/WebKit/WebKit/commit/75a2d3779951d3d18eb9fec609bf2f16c6274599
  Author: Sammy Gill <[email protected]>
  Date:   2026-09-25 (Fri, 25 Sep 2026)

  Changed paths:
    M LayoutTests/fast/repaint/align-items-overflow-change-expected.txt
    M LayoutTests/fast/repaint/align-self-change-expected.txt
    M LayoutTests/fast/repaint/align-self-overflow-change-expected.txt
    M LayoutTests/fast/repaint/justify-items-overflow-change-expected.txt
    M LayoutTests/fast/repaint/justify-self-change-expected.txt
    M LayoutTests/fast/repaint/justify-self-overflow-change-expected.txt
    A 
LayoutTests/imported/w3c/web-platform-tests/css/css-grid/implicit-grids/grid-item-placed-in-trailing-implicit-column-001-expected.txt
    A 
LayoutTests/imported/w3c/web-platform-tests/css/css-grid/implicit-grids/grid-item-placed-in-trailing-implicit-column-001.html
    M Source/WebCore/layout/integration/grid/LayoutIntegrationGridCoverage.cpp

  Log Message:
  -----------
  [GFC][Integration] Allow grid items in trailing implicit columns.
https://bugs.webkit.org/show_bug.cgi?id=320665
rdar://problem/183644533

Reviewed by Alan Baradlay.

This allows content when a grid item is has a column placement that is
outside any explicit columns. For example, grid-column: 4 / 5 should be
allowed if there are only two explicit columns.

* 
LayoutTests/imported/w3c/web-platform-tests/css/css-grid/implicit-grids/grid-item-placed-in-trailing-implicit-column-001.html:
 Added.
* 
LayoutTests/imported/w3c/web-platform-tests/css/css-grid/implicit-grids/grid-item-placed-in-trailing-implicit-column-001-expected.txt:
 Added.
Some extra test coverage since it did not seem like there were WPTs that
cover this case.

* LayoutTests/fast/repaint/align-items-overflow-change-expected.txt:
* LayoutTests/fast/repaint/align-self-change-expected.txt:
* LayoutTests/fast/repaint/align-self-overflow-change-expected.txt:
* LayoutTests/fast/repaint/justify-items-overflow-change-expected.txt:
* LayoutTests/fast/repaint/justify-self-change-expected.txt:
* LayoutTests/fast/repaint/justify-self-overflow-change-expected.txt:
Rebaseline these tests to reflect the fact that they are running through
the GFC path now.

Canonical link: https://commits.webkit.org/321954@main



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