So I'm trying to just simply embed a pano into my squarespace site. Using the basic iframe setup from the documentation and everything works fine minus the fullscreen button. I can't seem to get it to show up, I've tried a number of suggestions and solutions from throughout the message board but still not sure whats going wrong here. This is the embed code, any suggestions? 
<iframe src="______site_______" width="100%" height="800" frameborder="0" allowfullscreen="true" webkitallowfullscreen="true" mozallowfullscreen="true" oallowfullscreen="true" msallowfullscreen="true">
</iframe>