Failure of Success Criterion 1.1.1 due to not marking up decorative images in HTML in a way that allows assistive technology to ignore them

Important Information about Techniques

See Understanding Techniques for WCAG Success Criteria for important information about the usage of these informative techniques and how they relate to the normative WCAG 2.1 success criteria. The Applicability section explains the scope of the technique, and the presence of techniques for a specific technology does not imply that the technology can be used in all situations to create content that meets WCAG 2.1.

Applicability

HTML and XHTML

This technique relates to Success Criterion 1.1.1: Non-text Content (Failure).

Description

This describes a failure condition for text alternatives for images that should be ignored by AT. If there is no alt attribute at all assistive technologies are not able to ignore the non-text content. The alt attribute must be provided and have a null value (i.e., alt="" ) to avoid a failure of this Success Criterion.

This describes a failure condition for text alternatives for images that should be ignored by assistive technology (AT). If an image has the attribute role="presentation", it will be ignored by AT. However, if it does not have role="presentation", and if there is no alt attribute at all assistive technologies are not able to ignore the image. For decorative images which need to be ignored by AT, either role="presentation" must be used or the alt attribute must be provided and have a null value (i.e., alt="") to avoid a failure of this Success Criterion.

Examples

Tests

Procedure

For any img element that is used for purely decorative content:

  1. Check whether the element has no role attribute or has a role attribute value that is not presentation.
  2. Check whether the element has no alt attribute or has an alt attribute with a value that is not null.

Expected Results

  • If step #1 is true and if step #2 is true, this failure condition applies and content fails the Success Criterion.