Iframe data attr no longer seems to be working

[lstephensca]

I have used data-izimodal-iframeurl successfully in the past utilizing what is exactly in the documentation, ie:
<button data-izimodal-iframeurl="http://..." data-izimodal-open="#modal-iframe">Modal</button>

However, I came back to a test page today and it does not seem to be functioning at all. I am using the newest version and I dont see a reference to the data attribute at all in the source code for 1.6.0. Is this still a viable means of use?