If the text is sent as text. If it is embedded in images the text-to-speech won't read it.
I'm trying to think of what a bricks and mortar grocery store does for the blind? The products don't have braille on them and the signs on the shelves don't either. Maybe the ADA requires that a store employee helps the blind shopper which isn't an option on a website.
Be careful of perverts in the vegetable section if you are blind.
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