CSS media query not working in IE 9

Question

I have included some media queries in my design to change the width of some elements of the page based on the browser\'s width. The queries look like this:

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Answer 1

Make sure you have right DOCTYPE declaration. It's strongly recommended that websites use the HTML5 document type in order to support the widest variety of established and emerging standards (in this case: CSS3), as well as the broadest range of web browsers: