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I wouldn't add ALT tags to all images. Only those that add context to a page - if it's a design element that repeats from page to page it would be incredibly annoying to have it read out by a screen reader over and over again. Example: 'Company X Logo, Company X Logo, Company X Logo, Company X Logo....' How to wind-up the blind very quickly!!! I started my digital career working for an agency that specialised in producing accessible websites for schools, nurseries, public libraries etc. I learned a lot about how screen readers work there and it was a real eye-opener. (if you excuse the pun) XXX A