POUR – The Four Web Accessibility Principles

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The web industry-standard guidelines for accessibility are grounded in 4 key principles: Perceivable, Operable, Understandable, and Robust – POUR.

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cheat sheet

practical tips

  • Text alternatives should reflect the semantic purpose of an element, for example, a proper text alternative for a search button would be “search” rather than “magnifying glass”.
  • Avoid using flashing content or animations.
  • Provide mechanisms to switch off animations.
  • Provide different ways to find content (hierarchical navigation, search).
  • Make sure that functionality that is activated by movement (gestures) can also be activated through user interface components.
  • Make sure that buttons, links, and other active components are large enough to make them easier to activate by touch.
  • Define the primary language of a web page.
  • Provide definitions for any unusual words, phrases, idioms, and abbreviations.
  • Provide consistent navigation.
  • Don’t make significant changes on a web page without the consent of the user.
  • Provide descriptive instructions and error messages.

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