[Webkit-unassigned] [Bug 128173] New: [CSS Grid Layout] Percentages of indefinite sizes should compute to auto

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=128173

           Summary: [CSS Grid Layout] Percentages of indefinite sizes
                    should compute to auto
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svillar at igalia.com
        Depends on: 127033


According to the spec, http://dev.w3.org/csswg/css-grid/#valuedef-percentage, that's what we have to do.

This will fix examples like the following one

.grid {
width: -webkit-min-content;
height: auto;

-webkit-grid-definition-columns:50%;
-webkit-grid-definition-rows:20%;
}

<div class="grid"></div>

If we ask for getComputedStyle() for the <div> element, we'll get a negative value, because the renderer will try to compute a percentage of an undefined size (which is internally represented as -1).

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