Rhododendron

All users, regardless of disability, should be able to read, navigate, and contribute to Wikipedia easily. Therefore, when editing articles:

Don't impede the ability to distinguish links from regular text.
Don't use scrolling lists or collapsible sections to conceal content. (See exceptions in the Manual of Style).
Don't use color as the only means of conveying information.
Don't use tables for layout—use <div> blocks instead.
Don't leave blank lines between list items.
Don't use Unicode characters as icons or images.
Don't sandwich text between two images, and don't use fixed image sizes unless absolutely necessary.

Wikipedia dos and don'ts
Encyclopedia content	Accessibility Biographies Living Categorization Disambiguation Long dabs Images Leads Links Lists References Tables Titles of articles
Collaboration	Consensus Talk
Simple rule set - Simple style manual - Style tips - Wikitext cheatsheet

See also