[Webkit-unassigned] [Bug 198472] New: WebKit suppresses vertical scrollable overflow from rotated element if there's a short container element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=198472

            Bug ID: 198472
           Summary: WebKit suppresses vertical scrollable overflow from
                    rotated element if there's a short container element
           Product: WebKit
           Version: Safari 12
          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

(Blink/Chromium version of this bug: https://bugs.chromium.org/p/chromium/issues/detail?id=969564 )

STR
(1) Load this testcase: https://jsfiddle.net/jkcyLdxv/

EXPECTED RESULTS:
Both of the black-bordered scrolalble divs should have a vertical scrollbar (and should allow themselves to be scrolled vertically).

ACTUAL RESULTS:
The first div does not have a vertical scrollbar & does not allow itself to be scrolled vertically.


The only difference between the two divs is that the first one has a fixed-size wrapper around its contents.  This shouldn't matter from the perspective of scrollable overflow, because a fixed 'height' doesn't prevent descendants from creating vertical scrollable overflow that an ancestor scrollport ends up being responsible for scrolling.

Firefox and Edge give "expected result".  Chrome and Safari give the unexpected "actual results".

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