| CSS Valido! | Valid XHTML 1.0 Transitional | Level A conformance icon, W3C-WAI Web Content Accessibility Guidelines 1.0 | Level Double-A conformance icon, W3C-WAI Web Content Accessibility Guidelines 1.0 | Level A conformance, W3C-WAI Web Content Accessibility Guidelines 2.0 | Level Double-A conformance, W3C WAI Web Content Accessibility Guidelines 2.0 |