WebKit (Safari)

WebKit’s Bugzilla is Apple’s Safari/WebKit bug tracker. Because Apple still mandates WebKit as the only browser engine on iOS, this tracker is functionally the known-issues surface for every iOS browser, including the ones branded Chrome or Firefox on iPhone.

Track this if you ship anything that touches mobile web. The set of features that work in Chrome desktop but not in iOS Safari is large and stable; the tracker is the canonical reference for what each item is, and what its status is.