Answer:In the image tag alt is used to display an alternate 'thing' in case your image is unable to load properly due to whatever reason. This alternate 'thing' is in the form of text which describes what was the image all about. In your case it's so if it fails to load then whatever is written in the alt attribute will show up and if you had also left alt blank like in your defined question then the icon of the broken image will show up.
Explanation:
