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このWCAG 2.2 テクニック集の日本語訳は作業中となっています。WCAG 2.1 達成方法集の日本語訳をご利用いただけます。
[ WCAG 2.1 達成方法集 ]

Technique H67:Using null alt text and no title attribute on img elements for images that assistive technology should ignore

About this Technique

This technique relates to 1.1.1: Non-text Content (Sufficient).

This technique applies to HTML documents that load images.

Description

The purpose of this technique is to show how images can be marked so that they can be ignored by assistive technology.

If no title attribute is used, and the alt text is set to null (i.e., alt="") it indicates to assistive technology that the image can be safely ignored.

Note

Having a "null" alt attribute is not the same as having no alt attribute.

Examples

Example 1: Inserting a decorative image on a web page

<img alt="" src="squiggle.gif" height="20" width="20">

Related Resources

No endorsement implied.

Tests

Procedure

For each image that should be ignored:

  1. Check that title attribute is either absent or empty.
  2. Check that alt attribute is present and empty.

Expected Results

  • #1 and #2 are true
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