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Written by: Jonathan Avila
13 years ago

The Web Content Accessibility Guidelines Version 2 (WCAG 2) provide a much needed update of the original WCAG guidelines. Several of the original guidelines included language stating “until user agents support”. Many of the associated checkpoints for these items have been removed in WCAG 2 and do not appear as checkpoints. Additionally, other guidelines are no longer required – some are simply removed while others have been moved to advisory techniques or moved to Level AAA conformance. Below are two lists that highlight WCAG p1 or p2 guidelines that have been removed or no longer map to WCAG 2 Level A or AA. (Note Level A guidelines carry the greatest priority and are required for subsequent levels of conformance).

Key WCAG Guidelines that related to support within User Agents that are not mapped to WCAG 2

  • 10.2 For all form controls with implicitly associated labels, ensure that the label is properly positioned
  • 6.3 Ensure that pages are usable when scripts, applets, or other programmatic objects are turned off

Key WCAG Guidelines that are (part or all of) now Level AAA requirements (Some of these guidelines have been split out to allow for a gradient of conformance where one lies in Level AA conformance and the other is required for Level AAA conformance)

  • 14.1 Use the clearest and simplest language appropriate for a site’s content
  • 13.2 Clearly identify the target of each link (when taken out of context) Note – The identity of links when taken into context into consideration is a WCAG 2 Level AA guideline.
  • 7.1 Until user agents allow users to control flickering, avoid causing the screen to flicker Note –Flashing below a certain threshold is allowed for WCAG 2 Level AA conformance.
  • 10.1 Until user agents allow users to turn off spawned windows, do not cause pop-ups or other windows to appear (WCAG 2 does contain Level A and AA guidelines that require that the user be informed about new window but allows new windows to be opened if the user is warned)

Key WCAG Guidelines that are not mapped to WCAG 2

  • 11.1 Use W3C technologies
  • 11.2 Avoid deprecated features of W3C technologies.
  • 12.2 Describe the purpose of frames and how frames relate
  • 13.2 Provide metadata to add semantic information to pages and sites.

In addition, many other differences exist such as a new luminosity algorithm for determining color contrast. A comparison of the guidelines can be found at:
http://www.w3.org/WAI/WCAG20/from10/comparison/

Color Contrast Checker Using Luminosity Algorithm