That's almost SGML, except for the short form syntax for IDs: <div content> <form id=login> <input name=username> <input name=passwor

That's almost SGML, except for the short form syntax for IDs: <div content> <form id=login> <input name=username> <input name=password> </> </> Note though that including markup declarations for enumerating custom class names and for the input element having declared content EMPTY is required (the latter declaration actually part of HTML DTDs [1]): <!attlist div class (content) #implied> <!element input - - empty> Moreover, in SGML you can have tag omission/inference, like on the p element or the html element itself. Your "</>" Close current tag syntax is actually part of SGML (as is "<>" which is treated as start element tag for the most recently closed element), known as FEATURES MINIMIZE SHORTTAG ENDTAG EMPTY and FEATURES MINIMIZE SHORTTAG STARTTAG EMPTY features, resp. ([2]). [1]: http://sgmljs.net/docs/w3c-html52-dtd.html http://sgmljs.net/docs/w3c-html52-dtd.html [2]: http://sgmljs.net/docs/sgmlrefman.html http://sgmljs.net/docs/sgmlrefman.html