Bug 246498

Summary: Canvas strokeStyle does not always get applied
Product: WebKit Reporter: Jon Woyame <jon>
Component: CanvasAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: ap, dino
Priority: P2    
Version: Safari 16   
Hardware: Unspecified   
OS: Unspecified   

Description Jon Woyame 2022-10-13 18:31:53 PDT 
Safari's <canvas> has fairly recently acquired a regression where `strokeStyle` is not getting applied properly.

As stroke() is called iteratively, it sometimes uses older color values, despite `strokeStyle` being changed prior to the call.

This has been documented with a code snippet on Stack Overflow:

https://stackoverflow.com/questions/74050672/html5-canvas-context-does-not-update-in-safari

It is also observed in a similar example by @Kaiido:

https://jsfiddle.net/7awL4fg3/

This has been tested on a MacBook Pro with Apple Silicon, and several iPhones.

It is present in Safari 16 and Safari Technology Preview.
Comment 1 Alexey Proskuryakov 2022-10-16 18:59:56 PDT 
Sounds like bug 245465 (please see its dupes for details).

Please verify with a future Safari Technology Preview, once release notes say that it's beyond 254889@main.

*** This bug has been marked as a duplicate of bug 245465 ***