Why are glyphicons icons not showing up in iE?

Question

css

I am using Bootstrap 3

<span class="glyphicon glyphicon-search" aria-hidden="true"></span>

, or
<span class="glyphicon glyphicon-search"></span>
In Firefox, Chrome, the icon is displayed normally, but in IE it is not displayed at all, why is this?

Answer 1

Here they write that you need to change the security mode of IE