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Unfortunately, this style doesn’t do anything to help with videos that are embedded using iframes (the most common way to add a YouTube or Vimeo video to a page). For embedded YouTube videos, use Dave Rupert’s and Chris Coyier’s FitVids JavaScript program: http://fitvidsjs.com. This small bit of JavaScript code makes sure most embedded videos scale up or down to fit their container.


Cover of CSS3: The Missing Manual, 3rd Edition