How can I make the YouTube player scale to the width of the page but also keep the aspect ratio?
问题 I have a YouTube video I want to put on my web page. I want to scale the video to fit to a percent of the users browser but also to keep the aspect ratio. I have tried this: <iframe width="87%" height="315" src="http://www.youtube-nocookie.com/embed/dU6OLsnmz7o" frameborder="0" allowfullscreen></iframe> But that does only make the player wider, not higher. Does I have to resort to JavaScript (or non-standard CSS)? 回答1: I hit a similar issue with my site when developing some responsive CSS. I