ASSIGNED 210822
iframe with background-attachment: fixed needs to scroll synchronously 
https://bugs.webkit.org/show_bug.cgi?id=210822
Summary iframe with background-attachment: fixed needs to scroll synchronously
Simon Fraser (smfr)
Reported 2020-04-21 16:13:03 PDT
An iframe whose content has background-attachment: fixed needs to fall into the synchronous scrolling path.
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Radar WebKit Bug Importer
Comment 1 2020-04-21 16:13:17 PDT
<rdar://problem/62137075>
Simon Fraser (smfr)
Comment 2 2020-04-21 16:18:09 PDT
This is an ordering dependency between calling scrollingCoordinator->frameViewFixedObjectsDidChange() and creating the subframe's scrolling node.
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