[Webkit-unassigned] [Bug 180283] New: [css-grid] Automatic minimum size is not clamped if min track sizing function is auto

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180283

            Bug ID: 180283
           Summary: [css-grid] Automatic minimum size is not clamped if
                    min track sizing function is auto
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfernandez at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 328159

  --> https://bugs.webkit.org/attachment.cgi?id=328159&action=review

Test case to reproduce the bug

The spec is quite clear regarding this (https://drafts.csswg.org/css-grid/#min-size-auto):

"However, if the grid item spans only grid tracks that have a fixed max track sizing function, its specified size and content size in that dimension (and the input to the transferred size in the other dimension) are further clamped to less than or equal to the stretch fit the grid area’s size (so as to prevent the automatic minimum size from forcing overflow of its fixed-size grid area)."

It says that if the max track sizing function is fixed, it should clamp the automatic minimum size.

In the attached example we have a grid container with:
  grid-template-columns: minmax(auto, 0px);

So the automatic minimum size of the item needs to be clamped to 0px.
And the final size of the track should be 0px.

This is basically what this test wrongly checks:
http://w3c-test.org/css/css-grid/grid-items/grid-minimum-size-grid-items-017.html

Firefox does this right.

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