Add hover text without javascript like we hover on a user's reputation

In stackoverflow, when we hover on a user's reputation we see a text. I have seen this at many places and the source code tells me that it can be done without js. And i tried and got only this-

 <div="text">hover me</div>

Use the title attribute, for example:

<div title="them's hoverin' words">hover me</div>

or:

<span title="them's hoverin' words">hover me</span>

The title attribute also works well with other html elements, for example a link...

<a title="hover text" ng-href="{{getUrl()}}"> download link
</a>

Often i reach for the abbreviation html tag in this situation.

<abbr title="Hover">Text</abbr>

https://www.w3schools.com/tags/tag_abbr.asp