This is a plugin meant for Jekyll.
Example use:
Easily embed a YouTube video. Just drop this file in your _plugins
directory.
{% youtube oHg5SJYRHA0 %}
You can also specify a height and width. If you do not, it defaults to 560 x 420.
{% youtube oHg5SJYRHA0 500 400 %}
Breaked the html layout for me as well. I fixed it by changing the youtube.rb as follows (using maruku as markdown):
You need to remove 'allowfullscreen' and you need to have spaces between the iframe tags