Is it possible for a mobile browser to send an SMS using the device's built-in capabilities? By that I mean, NOT using some online SMS services provider but actually making the mobile device send the SMS (same you would do using J2ME).
I think a GSM modem is capable of acting as a SMS Gateway but you have to have the software installed on the modem to do this. You might also look into the Carrier Gateway Emails to SMS as another option. Example is AT&T [email protected]
There are a couple of free services popping up these days like ZeepMobile that you might also want to look into.
What exactly are you trying to accomplish?
No as a mobile browser is specifically built to render markup (html) documents. Therefore, if you wanted to send SMS via a mobile browser it would call a web server page and send from the server NOT the mobile browser.
Mobile OS and their applications have quite a lot of limitations. The closest you will see is the ability to hyperlink a phone # in a mobile browser to send a message but it will be handled via their SMS app not the browser.
There are lots of different mobile browsers out there, so I doubt that this is standardised. Safari/iPhone supports SMS URIs, which strikes me as a sensible approach to the problem and one that might be more widely supported than just the iPhone.
Based on the link (above) I found, and a comment from Zamel, I suspect this would work:
<a href="sms:+447787000000">SMS</a>
Although with a real phone number, and possibly escaping the + sign as %2B.
It's a good thing that is not possible. It would be quite a security risk IMHO. I imagine spammers would be all over it.