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The W3C's Web Content Accessibility Guidelines (WCAG) are the basis for many accessibility laws and more useful for actually learning what makes a site accessible.

If you don't already place an emphasis on using semantic HTML markup, learn more about that, it's the foundation of accessible design.

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Sighted developers should use a screen reader on their own sites to get an idea of what's up. Very simple changes with semantic HTML can make a world of difference. It's sometimes as simple as swapping tags for their semantic counterparts.