You can check if an image has alt text by turning on a screen-reader and selecting the picture to hear how it's described. You can also inspect the HTML of the image ...

You can add alt text to images on Twitter to aid visually impaired users encountering your tweets. You can add alt text using the Twitter mobile app by tapping the ...

Tall hamburger with a hand reaching for it. The introduction to the article, surrounded by a collection of examples of alt text, displayed over blank boxes, arranged in a scattered formation.