Accessibility in GTK 4
The big news in last weeks GTK 3.99.3 release is that we have a first non-trivial backend for our new accessibility implementation. Therefore, now is a good time to take a deeper look at accessibility in GTK 4.
Lets start with a quick review of how accessibility works on Linux. The actors in this are applications and assistive technologies (ATs) such as screen readers (for instance, Orca), magnifiers and the like.
The purpose of ATs generally is to provide users with alternative ways to interact with the application that are tailored to their needs (say, an enlarged view, text read out aloud, or voice commands). To do this, ATs need a lot of detailed information about the applications UI, and this is where the accessibility stack comes into play—it is the connecting layer between the application (or its toolkit) and the ATs.
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