Who Can't Read a Teaching Article: What WCAG Requires of Diagrams, Code, Formulas, and Video, Research on Screen-Reader Users, and the Evidence for UDL
In an online experiment, screen-reader users answered questions about online charts correctly 34% of the time, against 87% for the comparison group; when the chart came with a data table, the screen-reader group rose to 73%. Only 1 of this site's 192 mermaid diagrams in Chinese posts has an accessible title. The only UDL meta-analysis I could read in full pooled g = 3.56, but most of the studies it included had no control group.