This should be a <http://www.example.com/> link.
This should be a <mailto:john.doe@example.com> link.
As should <john.doe@example.com> this.
As should <john_doe@example.com> this.
As should <CSS@example.com> this.
Another ampersand <http://www.example.com/?doit&x=y> link.
More entities  <http://www.example.com/?doit&amp;x=&quot;y&z=y>.

Email international <übung@macht.den.meister.de>, <ü.äß@hülse.de>
Email invalid: <[me@example.com](mailtos:me@example.com)>

Autolink with underscore: <http://www.example.com/with_under_score>

<http://www.example.com/>

*[CSS]: Cascading