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University Technology Services

WCAG 2.0 AA Compliance

Principle 4

Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.

This is so that the coding of your web pages can be interpreted by newer web browsers as the world wide web evolves into a more advanced platform.

Guideline 4.1

Maximize compatibility with current and future user agents, including assistive technologies.

  • Section 4.1.1: In content implemented using markup languages, elements have complete start and end tags, elements are nested according to their specifications, elements do not contain duplicate attributes, and any IDs are unique, except where the specifications allow these features.
  • Section 4.1.2: For all user interface components (including but not limited to: form elements, links and components generated by scripts), the name and role can be programmatically determined; states, properties, and values that can be set by the user can be programmatically set; and notification of changes to these items is available to user agents, including assistive technologies. (By following the rest of WCAG, you will have satisfied this requirement.)


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    Beginning in May 2016, MAC ID passwords at McMaster expire annually. Learn more at

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