[Webkit-unassigned] [Bug 75283] New: Nested ruby rendering "collapses" when the line-height CSS property exceeds a certain value

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75283

           Summary: Nested ruby rendering "collapses" when the line-height
                    CSS property exceeds a certain value
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Major
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: waynerj at shaw.ca


Overview:
Nested ruby rendering "collapses" (the top line gets rendered where the next line below it is) when the line-height CSS property exceeds a certain value.

Steps to Reproduce:
Go to http://www.chinesetools.net/ruby/Mandarin-Expressions_line-height_bug.html.

Note the difference between the nested ruby elements in the "b...(line-height: 3.2em)" paragraph and the ones in the "bu...(line-height: 3.3em)" paragraph.

Actual Results:
When the line-height is set to 3.3em or higher instead of 3.2em, the top line of a nested ruby element gets rendered in the same location as the line that is supposed to be below it, as if the 3rd floor of a building collapsed down into the 2nd floor.

Expected Results:
The nested ruby elements should maintain their integrity as line-height increases.

Build & Platform:
Version 5.1.2 (6534.52.7, r103700) on Intel Mac OS X 10.6.8

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