[Webkit-unassigned] [Bug 191747] New: Small pixel errors rendering baseline alignment in vertical mode and ahem font

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191747

            Bug ID: 191747
           Summary: Small pixel errors rendering baseline alignment in
                    vertical mode and ahem font
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfernandez at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 355053

  --> https://bugs.webkit.org/attachment.cgi?id=355053&action=review

Test case to reproduce the issue

Steps to reproduce the issue:

1- load the attached test case

What is the expected behavior?
The inline elements are aligned using their baseline so that they match perfectly with the absolute positioned elements rendered under.
There should be a completely filled black 100px square and no red should be visible at all.

What went wrong ?
Several tiny (1px) red lines are visible, despite the offsets got from the insect indicate that the inline and absolute positioned elements should match perfectly.

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