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An image in your course or a document may need a fairly long description to accurately describe the content of the image. This is when it’s handy to add a long description to the image. Keep in mind that best practices for image descriptions still apply for long descriptions, just without the character limit of alternative text.
In most cases, long descriptions are available to all users. However some programs or websites may not fully utilize long descriptions. Because of this, we recommend you also consider adding a caption to the image as well.
在写长篇描述之前, be sure you have presented the visual in the larger context of a document, 演讲, 或者网页.
The following are instances when you would consider Long Descriptions
Congratulations, you can now add Long Descriptions to visuals.