2.01.11 Text equivalents: Summary

In conclusion

The "alt text" should reflect the function of the image in relation to the content so:

If the image has no meaning ie decorative:

Use a null alt text e.g. alt="".

If the image has only semantic meaning ie a rule, space or bullet:

Use a null alt text as it's just more noise to a screen reader.

If the image conveys the same meaning as written in the content text:

Use the shortest description possible, to the point of being curt.

Or use a null alt text if the image is not mentioned in the text.

If the image adds meaning to the content:

The alt text should succinctly reflect that additional meaning.

If it is not possible in less than 65 characters link to a full description elsewhere.

If the image is used as a heading:

The alt text should directly reflect the text in the graphic and be placed in heading elements.

Generally speaking:

A null alt text is always better than no alt text at all.

Multimedia:

Requires a link to a text transcript.

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