Has anyone yet heard/come up with a name for this design solution? It combines a loading animation / progress bar into the button itself.
The developer refers to it as 'ladda'.
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The other reference I found to these kind of buttons is called Loda . To quote the page
Loda Button jQuery plugin that animates the button icon with CCS3 when loading data from the server.
The animation is created using CSS3's animation, transitions and transforms, which are supported by Chrome, Firefox, Opera, and IE10.
Another naming convention I found for them (with a different loading animation) is progress buttons