Captions provide necessary image and chart descriptions for screen readers. Every image, except layout images and a hero banner, should have caption text below it.
Caption text has a top padding of 8 pixels. It sits below the image, aligning it to the edge.
Caption writing impacts accessibility and search engine optimization results. In some cases a chart converts to an image. Captions can then be used to describe what is in the chart because screen readers do not read text embedded in an image. See About cannabis for an example.
Use the following to help develop a caption:
- describe the image – think of the who, what, where, and when
- use active verb form in present tense
- keep it simple and to the point
- cite the source of the photo after the description
- use ‘Anonymous’ as the source if the photo is not available
- Avoid line breaks.
- Do not use emojis or special characters.
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