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    <p>Make sure that you have browser mode set to IE9 in developer tools</p> <p><img src="https://i.stack.imgur.com/RY1wC.png" alt="Developer tools"></p> <p>This is what MS says about doctypes <a href="http://msdn.microsoft.com/en-us/library/jj676915%28v=vs.85%29.aspx" rel="nofollow noreferrer">source link</a></p> <ol> <li><p>If a webpage specifies a doctype directive and includes an X-UA-Compatible header, the header takes precedence over the directive.</p></li> <li><p>If the browser supports the header, but not any of the specified document modes, it will use the highest supported document mode to display the webpage.</p></li> </ol> <p>Older versions of the browser that don't support the header use the to determine the document mode.</p> <p><strong>Internet Explorer 9 and earlier versions display webpages without directives in IE5 (Quirks) mode. As a result, we recommend all webpages specify a directive, such as the HTML5 doctype.</strong></p> <p>This flexibility allows the greatest compatibility for earlier versions of Internet Explorer that remain popular. </p> <p>Note Because all supported versions of Internet Explorer (including Microsoft Internet Explorer 6) interpret the HTML5 document type as a standards mode document type, we recommend using the HTML5 document type for all webpages that don't require a different declaration. <strong>This ensures that your webpages are display in the highest available standards mode.</strong></p> <p>The X-UA-Compatible header isn't case sensitive; however, it must appear in the header of the webpage (the HEAD section) before all other elements except for the title element and other meta elements.</p>
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