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4.1.1 Parsing (A)

Understanding 4.1.1 Parsing (A)

The code of the page must not cause browser or assistive technology conflicts. This ensures that content and functionality is presented in a way that works reliably across all supported browsers and assistive technologies.

Requirements / What to do?

  • HTML code must conform to the standard identified in the doctype statement;
  • ARIA code must conform to the rules for use with the host language (HTML).

Common mistakes

  • HTML elements are not well formed (opened and closed properly);
  • HTML elements include invalid attributes;
  • HTML id attributes use duplicate values within the same page;
  • ARIA attributes are invalid.

Useful resources