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What are the alternatives for diagrams? Would an ascii diagram be better? I'm not sure if screen readers would ignore all of the random characters or not.

I'm assuming just a text description would be better, but I don't know what other options are available.

Apple has gotten really good at text selection in images. I can take a screenshot of a webpage and then select the text in the screenshot, or I could take a photo of a sign and select the text in the sign.

Do you know if there is anything similar for screen readers?

For screen reader accessibility, isn’t text a better option? If I were working with an engineer who uses a screen reader, I’d document heavily in text. Good practice anyway, since diagrams aren’t great at depth.

If you had to list the top 3 best formats for use cases like this, what would they be?