You can use the standard HTML title attribute of image for this:
<img src="https://stackoverflow.com/questions/11716916/source of image" alt="alternative text" title="this will be displayed as a tooltip"/>
You can use the standard HTML title attribute of image for this:
<img src="https://stackoverflow.com/questions/11716916/source of image" alt="alternative text" title="this will be displayed as a tooltip"/>