[Webkit-unassigned] [Bug 261752] New: When a block quote exactly reaches the bottom of a column, its margin affects the subsequent column [Multicolumn]

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=261752

            Bug ID: 261752
           Summary: When a block quote exactly reaches the bottom of a
                    column, its margin affects the subsequent column
                    [Multicolumn]
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bya at 180g.co
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 467755

  --> https://bugs.webkit.org/attachment.cgi?id=467755&action=review

HTML showing the blockquote margin improperly affecting the next column

I have a <blockquote> that exactly reaches the bottom of a column. Even though it is entirely contained within a single column, the margin-bottom affects the next column.

However, if I decrease the margin-top of the <blockquote> by a single pixel – so that the bottom of the <blockquote> no longer reaches the bottom of the column - then the margin-bottom doesn't affect the subsequent column at all.

This is similar to WebKit bug #212505 (https://bugs.webkit.org/show_bug.cgi?id=212505). It doesn’t seem to be identical, though, because that bug identifies different behavior depending on whether the browser is in quirks mode. For this bug, the behavior is the same regardless of the rendering mode.

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