Can FirebaseUI's sign-in widget meet WCAG 2.1 AA, or is a custom Auth SDK form the safer path?
The goal is a sign-in flow that survives a keyboard-only and screen-reader audit against WCAG 2.1 AA: labeled controls, announced errors, and predictable focus — including after an OAuth redirect returns the user to the app. FirebaseUI for Web (the v6.x line at the time of writing, on top of the modular Firebase JS SDK) ships a drop-in widget, but it renders
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