The WorldWide Web Consortium has its own WYSIWYG HTML editor called Amaya. Its described at http://www.w3.org/Amaya/. It’s different from the other editors in that you can really work a lot more closely with the HTML. It’s got a structure view so you can see how your document is laid out as well as the more classic source view and, of course, the formatted view. Once you get used to its different way of working, it’s really a pretty nice editor! It doesn’t give you all of the whippy, gee-whiz features that the other editors have but it supports XHTML 1.1, XHTML 1.0, SVG, MathML and CSS. And since it comes from W3C itself, it generates code according to the standards.