To improve we accessibility we need to add Alt text to images. This is a brief description of what is shown on an image. The description is read by a screen reader to help the visually impaired.
The description needs to tell what the image is the more descriptive the better. Not just "a robot", "a gray robot" is better, even better would be "A gray robot with a square head. It is standing in front of a brick wall."
<img src="images/classic_robot" alt="A robot." />
<img src="images/classic_robot" alt="A gray robot." />
<img src="images/classic_robot" alt="A gray robot with a square head. he is standing in front of a brick wall." />
If the image has text that text should be in the alt text as well. If the image subject is doing something, describe that as well.
<img src="images/dorothy_anyplace.jpg" alt="LEGO Dorothy standing with her dog, Toto. caption reads: Dorothy was tired of being at home. She says 'Anyplace but home. Anyplace but home. Anyplace but home.'" />
If the image is decorative just add a blank alt="" tag. If it's a logo you can just call "brand name logo." So the visitor knows what site they are on. "logo" is not enough.
Alt text improves your search engine results. the phrase "A large brown dog sitting on the grass" will rank hiring than "a dog". It also helps SEO to name the image descriptively; not dog_001 or image_001. Give your images good names, like You should for variables.
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