{"id":"accessibility-principles","title":"Four principles of web accessibility","summary":"Examine whether people can perceive information, operate an interface, understand its content and use it with assistive technologies.","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":"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.","directions":["Structure first: examine semantic HTML and navigation order.","Experience first: examine barriers found in real tasks."],"category":"Technology and product","kind":"principle","kind_label":"Principle","persona_ids":["developer"],"revision":1,"updated_at":"2026-10-08T00:00:00.000Z","sources":[{"title":"Accessibility Principles","publisher":"W3C WAI","url":"https://www.w3.org/WAI/fundamentals/accessibility-principles/","edition":"Viewed 2026-10-08","region":"International web accessibility guidance","checked_at":"2026-10-08","reuse":"Independent editorial summary and source link; the original text is not republished."}],"review":{"status":"source-checked-editorial","expert_reviewed":false},"editorial_note":"Editorial English translation of the Korean edition. No professional translation or occupational expert review has been completed. Translation does not change the source jurisdiction.","language":"en","translation":{"status":"current","source_language":"ko","source_version":"kb-c87599a222901e7c","translated_at":"2026-10-08","professional_reviewed":false},"trust":"reference-data","version":"kb-52dd8d2baca73613","links":{"document":"/en/knowledge/accessibility-principles","markdown":"/en/knowledge/accessibility-principles.md","api":"/api/v1/knowledge/accessibility-principles?lang=en"}}