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WP Responsive Video
v1.0 · by Brandon_Orndorff
Simple light weight plugin that automatically makes all currently and future embedded video's responsive. There is no setup required, it just wo …
About this plugin
Simple light weight plugin that automatically and recursively makes all YouTube and Vimeo video’s site wide responsive.
Demo
Go to: http://www.brandonorndorff.com/wordpress/plugins/aas-digg-digg-alternative-wordpress-plugin/ and scroll to the bottom and shrink your browser window and watch the video resize to fit the screen.