Style guide
From RAWiki
Videos
To embed youtube videos, go the the video's youtube page and extract the unique video identifier string from the youtube video's URL like this:
For the video at this location: "https://www.youtube.com/watch?v=CcqxI7a6wSM" The identifier is CcqxI7a6wSM
Paste the identifier in between the youtube tags using the following format.
<youtube>CcqxI7a6wSM</youtube>
This displays like this: