[Webkit-unassigned] [Bug 220798] New: Elements get extra pixel on the edges bleeding their parent

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220798

            Bug ID: 220798
           Summary: Elements get extra pixel on the edges bleeding their
                    parent
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: maggotfish at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 418042

  --> https://bugs.webkit.org/attachment.cgi?id=418042&action=review

Reproduction with minimal html

Steps to reproduce the problem:
(1) Open the attached index.html file
(2) See red lines at bottom of elements (the red background is protruding through a transparent ~1px height line of the elements on top of it)

What is the expected result?

Elements should cover the entire space they take without their parents bleeding.


What happens instead?

Each element gets extra transparent padding of ~1px that's bleeding their parents.

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