The alt attribute

The alt attribute is an alternative text that will be shown if the browser cannot find the image specified in the src attribute of the img tag. It is a mandatory attribute for the img tag. If it is missing, the validator (a program that checks the correctness of HTML and CSS) will complain.

Example

Let's try to put an incorrect path to the image (leave it empty). Instead of the image, we will see the content of the attribute alt (it seems that this is normal text - but try to copy it - you will not succeed, it will stretch like an image):

:

See also