developing Core requirement

Non-text content not relied on

Group: images-and-media • Guideline: non-text-alternatives

Summary in Plain English

All non-decorative non-text content - not only images, but audio, icons, controls and the rest - has a programmatically determinable text equivalent.

Why It Matters

Text is the one form that can be rendered as speech, braille, larger type or a different colour. It is what makes content translatable to any user's needs.

Test Procedure from the W3C Draft

Quoted from the provision's informative document, informative/guidelines/images-and-media/non-text-alternatives/non-text-content-not-relied-on.md. It is the group's own procedure, not an editorial testing guide.

HTML alternative text for images

Procedure

Examine the source code of the HTML document to identify all non-decorative img elements.
Each img element has an alt attribute.
The alt attribute provides a text alternative which conveys meaning or content that is displayed visually.
If the image includes words that are important to understanding the content, the words are included in the text alternative.

Expected results

#2, #3, and #4 are true.

(Mobile) Videos include accessible name

Procedure

For each instance of non-text content:

Using native mobile screen reader to review all videos in the app.
When videos are navigated to an accessible name is read out.
The accessible name includes the title of the video.

Expected results

#2 and #3 are true.

W3C Raw Source Text

Verbatim from guidelines/groups/images-and-media/non-text-alternatives/non-text-content-not-relied-on.md · informative document: informative/guidelines/images-and-media/non-text-alternatives/non-text-content-not-relied-on.md

All non-text content that is not decorative includes a programmatically determinable equivalent text alternative.