what does the alt tag do in html
Alt tags. ALT tags provide a text alternative to an image. They are a way to describe an image to those who can not see the image. The most important function of an ALT tag is to explain to a blind user what an image is displaying. Search engine crawlers also use ALT tags to decipher what an image is or what it is representing. If you have images on your web pages that are not described by an ALT tag your HTML is not valid and you are not following this (and other) Google webmaster guidelines. What should go in a Alt tag? It is recommended to use text that fulfills the same function as the image.