What determines whether the Compatibility button appears in Internet Explorer 8 or not?
On some sites I develop, I've noticed that a Compatibility button is displayed next to the address bar. However, when I browse other websites, this button is not always available to me.
What determines if this button is displayed to the user? Is this related to the title tag <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7">
?
(Screenshot below what I'm talking about)
alt text http://img380.imageshack.us/img380/4858/compatabilitybutton.png
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