Writing Quality and SEO Tag

The Web has contributed to an evolution of our written and spoken language, adding to the language and its flexibility. Is it Web site, Website, Web-site, web-site, web site, or website? Some grammar wonks would say Web should be capitalized because it is the shortened form of the proper noun "World Wide Web"; others would say that all variations are correct as long as the use is consistent.  This is the flexibility of our changing language.