Stack Overflow tags - How do they display info on mouse over?

Question

At the event of mouse over each Stack Overflow tag displays an information box beneath itself. As long as the mouse is over the tag or over the info box, it continues to be visi

Answer 1

Add an event listener to the mouseover DOM event to display the info box. Add an event listener to the mouseout event to hide the info box. See Mouse event types for details. Retrieve the information that you want to display in the info box via XMLHttpRequest.