[Webkit-unassigned] [Bug 190580] New: display:unset does not stop an element from creating a new formatting context.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190580

            Bug ID: 190580
           Summary: display:unset does not stop an element from creating a
                    new formatting context.
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dan at flarework.com

Created attachment 352321

  --> https://bugs.webkit.org/attachment.cgi?id=352321&action=review

testcase

The `display: unset` rule should stop any element where it is applied from creating a new containing block.

This bug was found by nesting a position sticky inside a plain div with a single `display:unset` rule.

Expected behaviour - the sticky element should take its containing block from body (being the closest block formatting context)

Actual behaviour - The sticky element takes its containing block from the parent div

Steps to reproduce: scroll down and observe that sticky element does not stick. 

Works as expected in most recent Firefox and Chrome.

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