Hello!
I have found code in this forum, for html5 going full screen when clicked, using javascript.
But I get an error on web browser!
The file is here:
https://s3.amazonaws.com/develephant-html5/fullcanvas.zip
I’m trying but really can’t find the problem although the code is just a few lines.
Could someone please download and check the code?
Maybe the original creator @Develephant might help me? 
Thank you!