I\'ve recently seen a few links used without a protocol. It didn\'t seem too difficult to understand - I think it\'s a great idea and pretty intuitive.
For those of
If you are developing on a local machine there's possibility it will fail with src="file://host.com/filename".
src="file://host.com/filename".
In this situation you need to specify scheme explicitly: http://host.com/filename or https://host.com/filename.
http://host.com/filename
https://host.com/filename