[Webkit-unassigned] [Bug 63385] New: Incorrect column breaks? (CSS3 columns)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63385

           Summary: Incorrect column breaks? (CSS3 columns)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: julian.tibble at gmail.com


Created an attachment (id=98598)
 --> (https://bugs.webkit.org/attachment.cgi?id=98598&action=review)
HTML file showing column-breaking bug

See the attached test-case (column-break.html).

In Safari 5.0.5 and Chrome 12.0.742.100, the lines of text in the adjacent columns are not perfectly aligned with each other (the text in the second column is slightly higher). I believe that the lines in adjacent columns should be perfectly level (apart from the H2 heading in the second column).

Although the spec is not particularly explicit about breaking columns, the CSS3-multicol spec says that the problem of breaking columns is similar to breaking pages. The CSS2 spec for page-breaking says in section 13.3.3 that page-breaking is allowed _between_ line boxes inside a block container.

In the attached test-case I think that the column break is not occurring exactly in between line boxes, but is "borrowing" space from one line box to fill the bottom of the first column.

I believe this is a bug. Apologies if I've missed something in the spec.


Julian

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