[Webkit-unassigned] [Bug 192756] New: [LFC][BFC][MarginCollapsing] BlockFormattingState should cache the maximum positive and negative margin values for margin collapsing.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192756

            Bug ID: 192756
           Summary: [LFC][BFC][MarginCollapsing] BlockFormattingState
                    should cache the maximum positive and negative margin
                    values for margin collapsing.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zalan at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

When two or more margins collapse, the resulting margin width is the maximum of the collapsing margins' widths. In the case of negative margins, the maximum of the absolute values of the negative adjoining margins is deducted from the maximum of the positive adjoining margins. If there are no positive margins, the maximum of the absolute values of the adjoining margins is deducted from zero.

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