[Webkit-unassigned] [Bug 187413] New: WebKit is inconsistent on baseline alignment of elements with non-default "overflow" value (depending on whether scrollbars are present)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187413

            Bug ID: 187413
           Summary: WebKit is inconsistent on baseline alignment of
                    elements with non-default "overflow" value (depending
                    on whether scrollbars are present)
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dholbert at mozilla.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 344456

  --> https://bugs.webkit.org/attachment.cgi?id=344456&action=review

testcase 1

STR:
 1. Load attached testcase.
 2. Look at the positioning of the "abc" text.

ACTUAL RESULTS:
In the top "short content" case, abc is baseline-aligned with the text inside the black box.
In the bottom "tall content" case, abc is basleine-aligned with the border-bottom of the black box.

EXPECTED RESULTS:
These cases should behave the same.
Interoperability (and perhaps some spec text) suggest that the latter behavior (using the border-bottom for baseline alignment) is the correct behavior -- that's what Firefox, Chrome, and Edge do here.


NOTE: the two cases in this testcase are *identical*, aside from the fact that there's some taller content in the lower one.  Both of them involve an "overflow:auto;display:inline-block" element, which we're trying to baseline-align with some "abc" text.

I'm testing with Safari 11.1 on Mac OS High Sierra.

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