Plain JavaScript tooltip

Question

I am trying to make a tooltip in plain JavaScript which is shown on hover. Like the one in Stack Overflow on hover over the profile name a div is s

Answer 1

document.addEventListener("mousemove",function awesome(e){
if(e.target.id != ""){
e.target.title = "#"+e.target.id;
}
}); 

random stuff
some more random stuff

and you can do it with lots of other stuff, like className, tagName,etc...