[Webkit-unassigned] [Bug 194509] New: [css-grid] Indefinite percentage in fit-content track size is treated as 0

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Feb 11 11:28:37 PST 2019


https://bugs.webkit.org/show_bug.cgi?id=194509

            Bug ID: 194509
           Summary: [css-grid] Indefinite percentage in fit-content track
                    size is treated as 0
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: ASSIGNED
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: obrufau at igalia.com
                CC: jfernandez at igalia.com, rego at igalia.com

Created attachment 361698

  --> https://bugs.webkit.org/attachment.cgi?id=361698&action=review

testcase

What steps will reproduce the problem?
(1) Create a css grid sized under a max-content constraint, with a fit-content(100%) column size.
(2) Place a grid item inside it, with a min-content contribution of 50px and a max-content contribution of 100px.

What is the expected result?
The grid is 100px wide.

What happens instead?
The grid is 50px wide.

According to https://github.com/w3c/csswg-drafts/issues/3585, fit-content() with an indefinite percentage should be treated as minmax(auto,max-content) instead of resolving the percentage against 0.

Firefox and Edge already did this, and Blink has been fixed in https://crbug.com/927865

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