Screen Reader Image Alt Text. Visually impaired users using screen readers will be read an alt. If the image contains text include that in the alt attribute so the screen reader technology can access and convey it.
Img src images some image png alt this is the alt text the alt text is not shown when a page is viewed in the browser but it becomes visible when an image cannot be loaded. Mac users can also try voiceover. See example below for what a screen reader experiences when no alt text is used.
Adding alternative text to photos is first and foremost a principle of web accessibility.
Decorative images should be given empty or null alt text. Mac users can also try voiceover. Alt text alternative text also known as alt attributes describe the appearance and function of an image on a page. Search engine crawlers read the alt text value and screen readers use it to describe the image to users who cannot see.