bootstrap not supported ie8

Hi there

Why bootstrap 3 is not supported in my ie8?

I also added this line to layouts\main.php, head section:




<meta http-equiv="X-UA-Compatible" content="IE=edge">



There is no problem in FireFox or Chrome.

This is my site: Koola.ir

Thanks in advance!

This is not a Yii question: http://getbootstrap.com/getting-started/#support-ie8-ie9