Force Browser Mode=IE8 and document mode=IE8 Standards

Question

I have a internal website hosted on IIS. I added the following meta code and also add http-header that the page should in IE8 Browser mode and document mode.

Answer 1

We found it was caused by the checkbox in "Compatibility view settings" - "Display intranet sites in Compatibility View".

It works well after uncheck the box.

PS. Is it true that "localhost" is excluded from intranet sites?