[Webkit-unassigned] [Bug 126809] New: WebKit incorrectly resolves percent values for vertical padding against container *width* (instead of height), on flex items

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126809

           Summary: WebKit incorrectly resolves percent values for
                    vertical padding against container *width* (instead of
                    height), on flex items
           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: dholbert at mozilla.com


Created an attachment (id=220923)
 --> (https://bugs.webkit.org/attachment.cgi?id=220923&action=review)
testcase 1

STR: Load attached testcase.

EXPECTED RESULTS:
No red should be visible. (The flex item should resolve its "padding-bottom: 100%" against the container's height, and end up with 200px of padding, covering up all of the red.)

ACTUAL RESULTS:
Red is ivsible. Specifically, the top 100px of the container is lime, and the bottom 100px is red.

This indicates that the flex item is resolving its "padding-bottom: 100%" against the container's width (not height), which is incorrect for a flex item.

Spec reference:
http://dev.w3.org/csswg/css-flexbox/#item-margins
This was resolved by the CSSWG here:
http://lists.w3.org/Archives/Public/www-style/2013Mar/0688.html

Note that for a block, it'd be correct to resolve percentage vertical-padding values against the containing block's width.  But in a flexbox, it's supposed to resolve against the size of the respective dimension (the height in this case), per spec link above.

I tested this with (webkit-based) Midori 0.4.3.  Google Chrome (blink) development versions have the same problem -- see http://code.google.com/p/chromium/issues/detail?id=333533 . Firefox does not have this problem. (I tested both Firefox version 26 and current Nightly)

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