Four principles of web accessibility

Examine whether people can perceive information, operate an interface, understand its content and use it with assistive technologies.

Principle · Technology and product

Core concepts

• Perceivable: provide alternatives to visual and auditory information
• Operable: consider keyboard navigation and enough time to act
• Understandable and robust: consider consistent behavior, error guidance and interpretation by different tools

Application

Use the principles as a starting point for checking alternatives, focus order, input errors and document structure. Plan separate checks with assistive technologies and users.

Limitations and jurisdiction

Reading the principles or passing automated checks does not establish WCAG conformance or access for every disabled user. Check the target criteria and actual task flows.

Editorial perspectives

• Structure first: examine semantic HTML and navigation order.
• Experience first: examine barriers found in real tasks.

Sources

W3C WAI · Viewed 2026-10-08

Context: International web accessibility guidance

Source checked: 2026-10-08

Independent editorial summary and source link; the original text is not republished.

Related personas

Translation status

Editorial English translation of the Korean edition. No professional translation or occupational expert review has been completed. Translation does not change the source jurisdiction.

Translation prepared: 2026-10-08 · Source fingerprint: kb-c87599a222901e7c

API