Screenreader-accessible tables

[staranise]

A friend and I are trying to write a program that produces automated fic bingo cards with cut-and-paste HTML. We want to make the resulting tables screenreader-friendly, but neither of us can find a post done a while ago about what that would entail. It was possibly in the comments of a kink_bingo post.

Does anyone know what I'm talking about? Any help would be appreciated.