Hyperlinks and URLs

You don't need the slash at the beginning of relative urls (it is automatically added between the base url and the relative url).
The trailing slash at the end of a directory url is theoretically required, but in practice, the link also works without it.
You can have multiple email address in mailto: - just separate them with commas (no spaces).
Examples:
mailto:someone@gmail.com?subject=Great stuff!
mailto:someone@gmail.com?cc=stuff@stuffy.com
mailto:someone@gmail.com?bcc=noone@yahoo.com