● Perceivable ○ you know what it is. ● Operable ○ you can control it yourself. ● Understandable ○ you know what to do. ● Robust ○ It’s safe to use for any UA. The Four Principles of Accessibility
● Ameba Accessibility Guidelines ● freeeアクセシビリティー・ガイドライン ドキュメント ● 三井住友銀行Webアクセシビリティガイドライン ● Easy Checks – A First Review of Web Accessibility Check Web Accessibility Guideline