Document compatibility mode meta position invalid
This means that the URL in question has the document compatibility mode set too low in the <head>.
Why is this important?
The document compatibility mode can be set in the <head> and in HTTP headers. If it is set in the <head>, the meta tag should be included before the <title> and the other <meta> tags to ensure Internet Explorer is instructed what mode to use as early as possible.
What does the Hint check?
This Hint will trigger for any internal HTML URL which has document compatibility set too low in the <head>.
Examples that trigger this Hint:
The Hint would trigger for this URL if it appears below the <title> or other <meta> tags:
How do you resolve this issue?
Adjust page templates so that the document compatibility mode meta position is above the <title> and other <meta> tags.