MicroUI – A tiny, portable, immediate-mode UI library written in ANSI C (opens in new tab)

One clearly defined starting point is exposing any custom controls to accessibility APIs that are used to enumerate and interact (simulated mouse actions, reading the text, etc) with controls on the screen. Both scripting tools and screen readers make use of these. Built-in controls already have the enumeration and interaction feature and don't need additional code, but custom controls may not have that.In the MicroUI example here, there are buttons and text labels and other kinds of controls...