Apparently, Mermaid diagrams aren't accessible by default, for reasons I could not possibly explain to you, given that in sequence diagrams, all data is already labeled, named, and has relationships applied to it, which could easily just be converted into a text description.
Anyway, after learning about this fact an hour ago, all our mermaid diagrams now have hand-written (screenreader accessible) description texts, as well as the full suite of aria attributes (aria-labelledby,
aria-describedby, aria-label, aria-roledescription) to hopefully fix this issue.
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