What does <meta http-equiv=“X-UA-Compatible” content=“IE=edge”> do?

Question

What\'s the difference if one web page starts with

Answer 1

Since I can not add a comment to the marked answer I will just post this here.

In addition to the correct answer you can indeed have this validated. Since this meta tag is only directed for IE all you need to do is add a IE conditional.

Doing this is just like adding any other IE conditional statement and only works for IE and no other browsers will be affected.