[Webkit-unassigned] [Bug 111886] New: [CSS Grid Layout] Fix the auto-placement algorithm to fully match the specification

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=111886

           Summary: [CSS Grid Layout] Fix the auto-placement algorithm to
                    fully match the specification
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jchaffraix at webkit.org
                CC: tony at chromium.org, xan.lopez at gmail.com,
                    ojan at chromium.org
            Blocks: 103316


I believe the current algorithm doesn't totally match the specification as we do the following placing:
* Foreach grid items with a specified major axis, place it on the grid (placeSpecifiedMajorAxisItemsOnGrid(specifiedMajorAxisAutoGridItems))
* Foreach grid items with an auto major axis, place it on the grid (placeAutoMajorAxisItemsOnGrid(autoMajorAxisAutoGridItems))

The specification does a single loop over the unplaced grid items. See http://dev.w3.org/csswg/css3-grid-layout/#auto-placement-algo, point 4 of the algorithm. I am sure we can build a test case where our algorithm differs.

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