[Webkit-unassigned] [Bug 120044] New: [CSS Grid Layout] Unknown grid area should compute to 'auto'

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=120044

           Summary: [CSS Grid Layout] Unknown grid area should compute to
                    'auto'
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: hyatt at apple.com, bdakin at apple.com,
                    simon.fraser at apple.com, dino at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/f5c42430625856f4f0a711363fb5b66821314157

Per the specification, if the grid area specified for any <grid-line>
doesn't exist, it should compute to 'auto'. The original parsing
implementation allowed any <grid-line>, which is non-compliant.

This means that "grid-row: foobar / none;" is now (again) rejected
unless the grid element defines the required grid areas.

The testing framework was amended to reuse the existing grid element
so that we get the 'grid-template' definition as we assumed in the
testing. Also added a new test that checks that unknown grid areas
triggers the auto-placement algorithm when appropriate.

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