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Alternate text, also known as alt text is brief written text with a descriptive meaning that can help readers understand the function of images, photographs illustrations, GIF, or other visual elements on a website. It can be picked up via assistive devices, or when an image doesn't load (due to bandwidth issues or other reasons, such as).
The reasons why someone may need to rely on alt texts include:
Low vision or blindness
Bright lighting
Hearing impairment
Loud surroundings
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