Abbr tag (codepen)

Is it that important to provide abbr tag or tooltip where we can simply use title for the respective tag for a tooltip

The title is useful for other cases, for example screen readers or users with their javascript turned off. If you wish to customize the tooltip display, then that’s a great fallback option, but it is far more comprehensive to allow for both options.

But why is there javascript when theres nothing but just a tooltip to a text