What is X-UA-Compatible when it references IE=edge,chrome=1?

Question

I just saw this meta tag in the wild and was wondering it does and why it\'s used?

Answer 1

Also, starting in IE11 "edge" mode, which used to be experimental, is now the "preferred" mode - see Compatibility changes in IE11 Preview

Additionally, "document modes" are generally being deprecated in IE11 all together, so you should probably try to stop depending on them.