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Section 508 ICT Testing Baseline

18. CSS Positioning

Accessibility Requirements

  • WCAG SC 1.3.2 Meaningful Sequence – When the sequence in which content is presented affects its meaning, a correct reading sequence can be programmatically determined.

Test Method Rationale

Meaningful information provided solely through CSS content may not be in the Document Object Model (DOM). Equivalent information must be available without CSS.

Limitations, Assumptions, or Exceptions

  • Only the CSS techniques identified as Failures in WCAG 2.0 Level A and Level AA are included in this test. There may be other CSS techniques that affect conformance.
  • Inline styling is included in this test.

18.A for Test Procedure for Meaningful Background Image

CSS background image is now covered under Baseline 6.B Test Procedure for Images with empty text alternatives.

18.B Test Procedure for CSS Positioned Content

Baseline Test ID: 18.B-CSSPositionedContent

Identify Content

Meaningful content positioned with CSS

Test Instructions

  1. Check that the reading order of the content (in context) is correct without the CSS position property. [SC 1.3.2]
  2. Check that the meaning of the content (in context) is preserved without the CSS position property. [SC 1.3.2]

Test Results

If any of the above checks fail, then Baseline Test 18.B-CSSPositionedContent fail.

Advisory: Tips for streamlined test processes

  • These tests are not to be performed by disabling all CSS. Content is not required to be perceivable and operable with all CSS disabled.

WCAG 2.2 Techniques

The following sufficient techniques and/or common failures were considered when developing this test procedure for this baseline requirement:

Contact the ICT Baseline Working Group

Related Projects

The Baseline Alignment for Web is being developed to aid in determining if a test process aligns with the ICT Baseline for Web.