Is it possible to have attachments to be specified in the mailto: tag in HTML?
< a href=\"test@test.com?body=somebody&subject=someSubject\">my link < /a>>
Firstly, and it is important, mailto is not a "tag", it's a URL scheme. Secondly, no, the scheme only allows you to supply values for RFC 822 headers. There may be hacks supported by particular MUAs, but they won't be portable.
mailto