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">

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(Screenshot below what I'm talking about)


alt text http://img380.imageshack.us/img380/4858/compatabilitybutton.png

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It turns out the only thing that affects this is the tag <meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7">

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Note on the MSDN page on document compatibility: This tag must appear in the section of <head>

your code before any other tags besides the tag . <title>

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