Whether you are uploading your image via the Content Manager’s image upload widget or linking it in some other way, one of the necessary HTML attributes for any image is the alt tag. The text in your alt tag is used by screen readers, so that people who access the web using this assistive technology will be able to get the information that you are conveying in your image.
Userfocus has published an absolutely terrific post outlining five different ways to use alt text, and when you should use each kind. Read it here.
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