NEW303853
[css-grid-3] Need to collapse empty auto-fit tracks in masonry / grid-lanes layout 
https://bugs.webkit.org/show_bug.cgi?id=303853
Summary [css-grid-3] Need to collapse empty auto-fit tracks in masonry / grid-lanes l...
fantasai
Reported 2025-12-09 10:05:28 PST
Although the earlier spec treated auto-fit the same as auto-fill, the current spec uses a heuristic to determine which tracks are likely to be empty, and thus could be collapsed prior to masonry placement. We don't implement this heuristic, so we are not collapsing those tracks, causing us to fail the following WPT tests: track-sizing/auto-repeat/column-auto-repeat-017.html track-sizing/auto-repeat/column-auto-repeat-018.html track-sizing/auto-repeat/column-auto-repeat-021.html track-sizing/auto-repeat/column-auto-repeat-022.html track-sizing/auto-repeat/column-auto-repeat-023.html track-sizing/auto-repeat/column-auto-repeat-026.html track-sizing/auto-repeat/row-auto-repeat-015.html track-sizing/auto-repeat/row-auto-repeat-016.html track-sizing/auto-repeat/row-auto-repeat-019.html track-sizing/auto-repeat/row-auto-repeat-020.html track-sizing/auto-repeat/row-auto-repeat-021.html track-sizing/auto-repeat/row-auto-repeat-024.html
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Radar WebKit Bug Importer
Comment 1 2025-12-09 10:05:35 PST
<rdar://problem/166155130>
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