The right to pay heavy taxes should not be denied to anyone, regardless of physical ability. John knows how important that is. His selection of Dijit was a good one here, because it handles a lot of the A11y details (A11y = A + 11 letters + y, a standard abbreviation).
One a11y consideration is low vision. Usually this is overcome by high-contrast color schemes. Dijit automatically detects this condition, and renders the page accordingly. You can simulate this by merely changing the body class from "tundra" to "a11y":
Graphic embellishments, like gradients, are eliminated so as not to blend into the important text. And all graphic symbols are placed with clearer text ones, as in the Title Pane:
