Many Web browsers support email.
Many email messages carry HTML documents. The HTML threading submission recognizes this and proposes to establish conventions for using HTML in email. Style sheets Note that this submission makes some extensions to HTML 4.0. The submission also associates metadata information in XML with HTML messages. Placing a Submission on a Working Group agenda does not imply endorsement by either the W3C Staff or the participants of the Working Group, nor does it guarantee that the Working Group will agree to take any specific action on a Submission.