Hi,
Big lover of embed responsively. I use it all the time on my website. However, Wordpress' 3.9 release has completely screwed it up!
Seems the embeds in 3.9 are being stripped by the new Wordpress set-up.
For example, here is a Vine using embed responsively:
<style>.embed-container {position: relative; padding-bottom: 100%; padding-top: 30px; height: 0; overflow: hidden;} .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }</style>
<iframe width='100%' src='https://vine.co/v/M1uDq6dhY6U/embed/simple' frameborder='0' scrolling='no' allowtransparency='true'></iframe><script async src='//platform.vine.co/static/scripts/embed.js' charset='utf-8'></script>
Here's what wordpress changes this code to automatically after you've switched between visual/text editor on wordpress:
<iframe src="https://vine.co/v/M1uDq6dhY6U/embed/simple" width="100%" height="150" frameborder="0" scrolling="no"></iframe><script src="//platform.vine.co/static/scripts/embed.js" async="" charset="utf-8"></script>
The same thing happens for Getty Images also (haven't tried Instagram yet)
This is terrible news as I use embed responsively in almost every article that is published!