The mailto: protocol allows specifying the to, cc, bcc, subject, and body of an email.
There is an undocumented Gmail URL format that does the same thing, but forces it to open in Gmail:
https://mail.google.com/mail/u/0/?tf=cm&to=to@example.com&cc=cc@example.com,cc2@example.com&bcc=bcc@example.com&su=subject+here&body=line1%0Aline2
Is there a way to pre-populate the body as html/markdown in the Gmail URL? I know mailto: doesn't support html, but I was wondering if Gmail does.
