I have this mock up HTML/CSS website here that is working perfectly fine on Firefox/Chrome but on Internet Explorer, the organization of the page is breaking; footer div is coming to the header section). I have tried to debug it but no luck.
It would be great if you can take a look into it and give me some pointers.
https://www.csupomona.edu/~tahoang/tu-template/
Thanks!!
I also notice in the Footer that you having a bunch of the columns positioned relatively, there is no need for that. You may remove that.