Bug 197150

Summary: Clarify normal flow vs. stacking layers in RenderLayer
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: bfulgham, simon.fraser, zalan
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Description Simon Fraser (smfr) 2019-04-21 10:10:22 PDT 
collectZOrderLayers() has logic that says:

bool stacking = isStackingContext();
if (!isNormalFlowOnly())
...

but it's no clear if a layer can be neither stacking nor normal flow only.
Comment 1 Simon Fraser (smfr) 2019-04-23 14:00:55 PDT 
A position:relative layer is not normal flow, and not a stacking context.