[Question] GTK3 and GTK4: How broken is Accessibility on non Linux Platforms?

No. GTK3 has no support for accessibility API on Windows or macOS. Never had, and won’t get it in the future, as the toolkit is feature and API frozen.

GTK4 has a completely new accessibility API for widget and application developers; underneath it, it “speaks” the same protocol as GTK2, GTK3, Qt, and web browsers—i.e. AT-SPI.

There is currently no implementation for assistive technologies on non-Linux platforms, but the new API in GTK4 is designed to be portable from day 1.

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