I have worked eight years designing and implementing websites with standards compliant code (html5, xhtml and css) with cross browser functionality, specifically with the emphasis on meeting the accessibility standards defined in WCAG 2. This includes using javascript/jQuery accessibly, with elegant degradation if javascript is disabled in the user's browser.
My aim is to provide an equivalent experience for those with visual impairments or motor coordination issues by building in accessibility from initial development - not as a last minute bolt on.
I have also undertaken a number of accessibility audits of major sites, such as Boots, and providing a report of problem areas along with practical solutions.