The alt attribute was first introduced in HTML 2 (1995), so it’s been with us for an awfully long time. This little three-letter attribute is so important; not only does it help with Search Engine Optimisation (SEO), but it also improves the accessibility of your site.
Alt attributes and accessibility
Accessibility on any site is vital, and alt attributes help by offering a readable text version of an image. If a user has to use a screen reader (for example, due to visual impairment) then they will have the alt text read to them. This means that the text you put into your alt attribute needs to make sense.
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