Why do we use alt , parent,self in <img>

Answer 1

The required alt attribute specifies an alternate text for an image, if the image cannot be displayed.
The alt attribute provides alternative information for an image if a user for some reason cannot view it (because of slow connection, an error in the src attribute, or if the user uses a screen reader).

Answer 2

Naveena Navi The alt attribute is used to display a discription or a text about the image just in case the Brower doesn't load it because of Internet or support issues