These two attributes on SVGSVGElement are gone from the spec:
They were removed from Chromium here:
Gecko doesn't have currentView, but the bug for removing useCurrentView is here:
(In reply to Philip Jägenstedt from comment #0)
> Gecko doesn't have currentView, but the bug for removing useCurrentView is
That has a patch I wrote 6 years ago and didn't land. :-)
Anyway, yes these are a straightforward removal.
Created attachment 462585 [details]