Check out Popup Caption at joeworkman.net/rapidweaver/stacks/popup-caption/
The Image Popup Stack is the easiest way to add animated popup captions to your images. When you hover over the image, it will reveal contents of the caption. This stack allows a portion of the caption to always be shown as well as the ability to hide the entire caption.
Check out the documentation for features that may have been added or changed since this video was recorded.
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