If your website shows the compatibility button when you browse it in IE8 (Internet Explorer 8) then this is how to remove the button.
Simply add the below line to the <head></head> section of your website:
<meta http-equiv="X-UA-Compatible" content="IE=8" />
An example of this is place would be:
<head> <meta http-equiv="X-UA-Compatible" content="IE=8" /> </head>
This must be the first meta tag in your code, otherwise it doesn’t work.