Test Suites:
Compatibility charts:
Tutorials:
What's up in the field of QA and XHTML.
Sometimes, documents are transversal through the web technologies, we try to identify some common problems and put it inside a note.
HTML test suite - www-html-testsuite@w3.org: There was a lack of good test suites for HTML and XHTML. So, W3C HTML WG has initiated the design of a test suite for HTML that could be used to test User Agents and programing library. Read the XHTML QA Plan threads on www-qa
Minimal test on XHTML 1.0 and XHTML 1.1 from Tantek Çelik.