There are a few online websites where you can find web
standards. These websites include The Web Standard Project, W3C,
W3Schools, and the Web Standards Group.
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I think what you may be asking is "who sets the standards for
html" and the answer is the World Wide Web Consortium
http://www.w3.org/.
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The W3C project promoting web accessibility is the Web Accessibility Initiative, which can be found at: http://w3.org/WAI.
The WAI develops standards for use in web pages and support materials allowing people to understand the importance of web accessibility, and implement it. It welcomes participation from around the world.
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The term "standards-compliant" relates to websites and browsers'
compliance with web standards. These web standards were proposed by
the World Wide Web Consortium.