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We follow the Australian Government Style Manual: Alt text captions
Alternative text explains information in images for screen reader users. Captions describe images to help users relate them to surrounding text. Titles identify images and number them in long-form content.
The only images that do not require alt text are:
sensory images
if the image is intended to create a sensory experience. For example, an image of an artwork.
decorative images
if the image is pure decoration, used for visual purposes only.
For sensory and decorative images, leave the alt text field blank. In the page's HTML code there will be two double quotes, which tells the screen reader to skip it.
These resources are useful for tips on how to write great alternative text descriptions:
More information
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