Header set X-UA-Compatible "IE=Edge" <FilesMatch "\.(js|css|gif|png|jpe?g|pdf|xml|oga|ogg|m4a|ogv|mp4|m4v|webm|svg|svgz|eot|ttf|otf|woff|ico|webp|appcache|manifest|htc|crx|xpi|safariextz|vcf)$" > Header unset X-UA-Compatible </FilesMatch> HTML5 Boilerplate: The web’s most popular front-end template