Bug 190580

Summary: display:unset does not stop an element from creating a new formatting context for sticky children.
Product: WebKit Reporter: Dan Peddle <dan>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: dan, mrobinson, ntim, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: Safari 14   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
testcase none

Dan Peddle
Reported 2018-10-15 08:21:26 PDT
Created attachment 352321 [details] 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.
Attachments
testcase (992 bytes, text/html)
2018-10-15 08:21 PDT, Dan Peddle 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Dan Peddle
Comment 1 2018-10-17 10:54:16 PDT
I've played a bit more, and `display: unset` works as expected for other child elements - seems like `position: -webkit-sticky` is the only thing that's misbehaving.
Radar WebKit Bug Importer
Comment 2 2018-10-17 11:22:30 PDT
<rdar://problem/45344773>
Dan Peddle
Comment 3 2021-05-09 14:11:36 PDT
Still present in Safari 14, description updated.
Martin Robinson
Comment 4 2021-08-25 03:55:36 PDT
This should be fixed now. *** This bug has been marked as a duplicate of bug 224415 ***
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