I have an HTML table displaying some information with a few rows. On each row, the user can click to reveal some additional rows that contains information related to the clicked row.

Something like this:

While the additional rows are being created with an AJAX request, a loading row is inserted right after the clicked row :

Currently, everything works perfectly (drill down style), but I would like to add some animation to the loading row. I found a question ( this one ) that has a JSFiddle showing kind of what I want ( this fiddle ).

I tried to implement something similar with CSS3 transitions, but I can't get it to work. Here's my simulated attempt ( fiddle only for deployment of the loading row ) using these transitions :

-webkit-transition: height 0.1s ease-in-out;
-moz-transition: height 0.1s ease-in-out;   
-ms-transition: height 0.1s ease-in-out;
-o-transition: height 0.1s ease-in-out;
transition: height 0.1s ease-in-out;

Any thought on why my fiddle doesn't do any animation? Any other methods you would propose?

Thanks!