XHTML works by separating content from style. Content creators craft HTML; designers create style sheets. This simplifies the Web server’s job, since site visitors need to download a style sheet ...

"Vendors are the ones who drive innovation on the Web for the most part." So if it's so clear today that HTML 5 is the way to go, why was so much energy, time, and research invested in XHTML 2?

The free and fully-featured Markdown editor for Windows allows you to write using an easy-to-read, easy-to-write plain text format, and then convert it to structurally valid XHTML (or HTML).