In SharePoint 2007 many customers provided lots of feedback to Microsoft… ok, they complained… that the markup generated by SharePoint 2007 (which also meant WSS 3.0 & ASP.NET 2.0) was not clean, concise or friendly to accessibility requirements.

Microsoft heard this loud and clear and committed to have SharePoint 2010 generate WCAG 2.0 AA complaint markup. However you may seen or heard in various places, even from a Microsoft person, in a blog or in some news report, that SharePoint is also generating XHTML 2.0 Strict markup… that is not true. The product team has not committed to that and in my opinion people seem to be getting a bit too carried away. This is usually the result of folks who seem to be inferring what WCAG 2.0 AA is (frankly… as we’ve all seen, there’s a lot of misunderstanding about what an accessible site really is). There are and will be a few extra attributes that Microsoft added to the markup which would not conform to the strict rules. Regardless, the most important thing here is