Which X-UA-Compatible takes precedence? Http-header or Meta-tags?
As the question states basically. If you have X-UA-Compatible in both your HTTP headers and a meta tag on your document, and they conflict, which one gets respected by IE?
Solution
TL;DR: The meta tag wins
I found the following (updated) flowchart here (link is broken) and associated blog post that provides an explanation of how IE9 determines document mode:
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