[Webkit-unassigned] [Bug 54613] New: percentage based margin-top for an absolute positioned element is computed based on the height of the viewport.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=54613

           Summary: percentage based margin-top for an absolute positioned
                    element is computed based on the height of the
                    viewport.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: phiw at l-c-n.com


Created an attachment (id=82750)
 --> (https://bugs.webkit.org/attachment.cgi?id=82750&action=review)
test case

An absolute positioned element whose containing block is the viewport (initial containing block) has percentages for its margin-top computed based on the height of the viewport (instead of the width).

Css 2.1:8.3 is formal in specifying that percentages for margin (and padding) are computed based on the *width* of the containing block.
http://www.w3.org/TR/CSS21/box.html#propdef-margin

In the testcase, the div has a 5% margin-top. Widening or narrowing the window horizontally doesn’t change the position of the block.

Gecko and Opera behave correctly.

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