CSS Tooltips not displaying?

[DennisSuitters]

I am in the process of editing elFinder to include aria-label attributes to help with ARIA Compliance to the project as it currently doesn't support this, but this isn't my question.

I am able to add this to the buttons js/ui/buttons.js as I experiment and build the project:

    .attr('data-tooltip', 'tooltip')
    .attr('aria-label', cmd.title)

These are added just fine, as you can see I am also adding a data-tooltip="tooltip" attribute to utilise my own custom CSS only Tooltips. These work just fine on other elements on the page, but refuse to show on any of the elFinder buttons, is there something that you could think of within the project styling or scripting that might be preventing this. I checked in the inspector in Chrome, and besides the scripting interaction changing classes, I don't see anything that would be stopping the display of the tooltips, I even removed the overflow: none from the button class thinking that was stopping it, but it wasn't.