Ah, got it. The first think you an do is read up on Accessibility. There are actually coding conventions that have been established that will be really helpful in understanding how the internet (and websites) need to provide accessibility. (Accessibility is an actual profession and people study for this profession and work in this field. There is a lot of information out there on the topic.)
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The second thing is to read the documents of this subreddit within the right sidebar, starting with this:
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It's a great question, and it's good to create an awareness that many millions of Internet users have accessibility needs.
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And it's a huge step forward to ask questions like this, compared to what many business owners say, which is, "Why do I have to have anything accessible?!"
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So thanks!