شرح الخواص الجديدة في ال Media مواقع مهمة http://screensiz.es/phone http://stackoverflow.com/questions/16443380/common-css-media-queries-break-points https://css-tricks.com/snippets/css/media-queries-for-standard-devices/ https://scotch.io/quick-tips/default-sizes-for-twitter-bootstraps-media-queries https://responsivedesign.is/develop/browser-feature-support/media-queries-for-common-device-breakpoints ……………………………… مكتبة ممكن تضيفها بالموضوع ده https://gist.github.com/hs0ucy/3762901