ALT The image says "click here" with an arrow pointing to the ALT description tag in the bottom left corner. Side note for everybody: Many Twitter users, including brands, have been using this to prompt people to open the ALT text, where they have left a joke. ALT text is a hugely important accessibility tool designed to help people navigate the internet more easily, so it shouldn't be used as a punchline. This is especially true if the ALT text doesn't describe the image, leaving blind and visually impaired people out of the joke.