[Webkit-unassigned] [Bug 221876] New: Overflow Auto Requires Specified Height

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221876

            Bug ID: 221876
           Summary: Overflow Auto Requires Specified Height
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: developerjustin at icloud.com

Created attachment 420240

  --> https://bugs.webkit.org/attachment.cgi?id=420240&action=review

A screen recording of the scrolling issue described in the bug

I wasn't able to find a duplicate of this anywhere, so I'm submitting a new bug. 

I've noticed this behavior on a few websites that seem to all work in other engines/browsers but I believe I've narrowed down the issue. 

In most browsers, elements can be set to overflow: auto; and allow scrolling without manually specifying a height. I've attached a video example of what I'm describing as seen in a web app for the bug-reporting tool Bugherd. In most browsers, the vertical list of issues can scroll but in Safari (TP and standard) it won't scroll until a height is specified. 

I was able to reproduce this in a few other websites but this was the easiest to record and share. 

Is this expected behavior?

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