IE9 Compatibility Mode and HTML5 Websites
Users encounter IE9 switching to compatibility mode on certain websites, rendering HTML5 content in a diminished fashion. This article investigates the underlying cause and provides a solution to maintain automatic compatibility mode.
Compatibility Mode Factors
In the absence of an X-UA-Compatible header, IE9 selects a compatibility mode based on several factors:
Resolution
To ensure the desired compatibility mode, site authors can explicitly set it using the X-UA-Compatible meta tag or HTTP header. By specifying "IE=Edge," websites can force the use of the latest IE renderer, regardless of version.
Sample Code
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
X-UA-Compatible: IE=Edge
By implementing this solution, websites can override any automatic compatibility mode settings, guaranteeing accurate rendering of HTML5 content in IE9 and subsequent versions.
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