W3C cheatsheet
Accessibility: WCAG2 at a Glance Perceivable Provide text alternatives for non-text content. Provide captions and alternatives for audio and video content. Make content adaptable; and make it available to assistive technologies. Use sufficient contrast to make things easy to see and hear. Operable Make all functionality keyboard accessible. Give users enough time to read and use content. Do not us
mozilla.org Markup Reference
fantasai The purpose of this document is to define a rich vocabulary of semantic classes whose presentation can be specified in site-wide style sheets—enough to be able to write a long, involved, well-styled document without once writing a CSS rule. These classes take the place of the old presentation templates; the presentation is now defined in the site style sheets, allowing the markup to remai
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