[Webkit-unassigned] [Bug 147953] New: Percentage padding of absolutely positioned element being calculated based on parent's content width instead of containing block.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147953

            Bug ID: 147953
           Summary: Percentage padding of absolutely positioned element
                    being calculated based on parent's content width
                    instead of containing block.
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: keithjgrant at gmail.com

Create a relatively-positioned container that has left/right padding. Inside that, create an absolutely-positioned element with left: 0 and right: 0, so its width equals the width of the container. Give the absolutely-positioned element a percentage based left and/or right padding, and that padding will be calculated based on the width of the container's content, rather than the width of the containing block.

I've recreated the bug here: http://codepen.io/keithjgrant/pen/LVvbYZ

The spec states the percentage is calculated with respect to the width of the containing block (http://www.w3.org/TR/css3-box/#the-padding). The containing block should be determined by the padding edge of the ancestor (http://www.w3.org/TR/css3-box/#the-padding).

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