HTML 2.0 Materials| www.w3.org
Advanced Images| webaim.org
Discover the resources for adding interactive charts for browsers and mobile devices.| Google for Developers
Accessibility resources free online from the international standards organization: W3C Web Accessibility Initiative (WAI).| Web Accessibility Initiative (WAI)
WHO fact sheet on blindness and visual impairment providing key facts, definitions, causes, who is at risk, global and WHO response.| www.who.int