RESOLVED DUPLICATE of bug 183397 196165
CustomElementRegistry#upgrade is not implemented 
https://bugs.webkit.org/show_bug.cgi?id=196165
Summary CustomElementRegistry#upgrade is not implemented
Justin Fagnani
Reported 2019-03-22 16:23:46 PDT
https://html.spec.whatwg.org/multipage/custom-elements.html#dom-customelementregistry-upgrade This is implemented in both Chromium and Gecko.
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Ryosuke Niwa
Comment 1 2019-03-23 23:37:36 PDT
Has been fixed in iOS 12.2 and Safari 12.1. *** This bug has been marked as a duplicate of bug 183397 ***
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