Mostly everyone now uses jQuery to build static/dynamic websites. If you are one of those developers, Fitvids.js will help you to embed videos to your web pages very easily in a lightweight manner. Ever tried to embed a video from video by copying the iframe tag from the youtube video? All of us who has the need for doing it has done it at some point in our lives. But the problem here is that the iframe is not responsive and will not change size according to the device width. Then you will have to write CSS code to make it responsive. Luckily now you have a JavaScript library that uses jQuery to embed the videos for you. It is responsive, fast, lightweight, supports all the browsers, and easy to use.

It's free and it solves easily a not-so-trivial problem designers have to face when embedding videos from popular sites like YouTube and Vimeo in responsive layouts. Now I just include Fitvids.JS and let it do its magic. Almost everytime I get perfectly sized video embeds in my responsive designs.

It's a nice little utility that removes the guesswork out of sizing textual headings in webpages if you need them to inflate to fit a specific container. So it's very good for responsive web design where you have this particular need and don't want to fiddle endlessly with viewport width CSS units, etc.