remove unsafe @viewport declarations
remove @viewport unsafe declarations for IE10 and non-responsive websites

snippet for IE 10
http://css-tricks.com/snippets/javascript/fix-ie-10-on-windows-phone-8-viewport/,
non-responsive website test case http://jsbin.com/ayudiq/5/edit, more
info on IE10
http://timkadlec.com/2013/01/windows-phone-8-and-device-width/ and Opera
http://dev.opera.com/articles/view/an-introduction-to-meta-viewport-and-viewport/