I take nothing away from what he did and I'm one of those people who dislike it when some people belittle what he did. He did the browser and the protocol and the url scheme. The excellence of NeXTSTEP helped. I only recently learned that a lot of the design of html, in terms of deciding how to fit sgml to markup the "Web" was also Dave Raggett. So people who say TBL "copied" SGML are wrong in two ways. There was also Calliau. Then all the other html "tags" that came afterwards, with NSCA Mosaic and Netscape and then W3C additions. Andreessen famously suggesting img etc. But TBL joined html with what else it needed to take over.