[Webkit-unassigned] [Bug 97110] New: [CSS Regions] Correctly apply style properties that vary per region

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97110

           Summary: [CSS Regions] Correctly apply style properties that
                    vary per region
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: abucur at adobe.com
                CC: hyatt at apple.com, mihnea at adobe.com
        Depends on: 72505,74131,96736
            Blocks: 57312,71487


There are some cases where the computed style for an element that breaks between regions to be different in each region. For example:
- percentage margins/paddings - they are computed using the width of the containing block, that may vary between regions
- region styling for layout properties - it is possible to style differently the margins, paddings etc of an element based on the region where it gets laid out. Also, region styling line height properties changes the meaning of EM units for all the other Length properties
- region styling for paint properties - the content needs to use the paint styles of the region it is getting painted into

Use this meta bug to track all the issues related to style diffs between regions.

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