<http://www.whatwg.org/specs/web-forms/current-work/#for-mailto> <http://www.whatwg.org/specs/web-forms/current-work/#x-www-form-urlencoded> (#4)
In mailto URIs, %20 represents a space. <form action="mailto:";> <input name="subject" value="1 2"> <input type="submit"> </form> If you submit that form, "mailto:?subject=1+2"; will be passed to the mail client instead of "mailto:?subject=1%202";. This results in "1+2" in the subject field instead of "1 2". Are UAs allowed to use %20 instead so things come out right, or must mail clients decode + to a space? Thunderbird, M2, and Outlook express don't decode +s. RFC2368 is referenced, but it and application/x-www-form-urlencoded that the mailto: form methods are referenced under conflict with each other on whether a space should be encoded to %20 or +. -- burnout426
