Alt-text in its most basic form is a description of the image on your web page written into the code. The description is used by screen readers and other assistive technology to convey the meaning of the image to a person who has low vision.
You might be thinking: That sounds like extra work for a small group of people. It is not a small group at all. According to the Centers for Disease Control and Prevention, approximately 12 million adults over age 40 in the U.S. have a vision impairment, including 1 million who are blind.
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