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Do you want to annotate diagram elements with various callouts (rectangle or oval balloon, thought, brace) but not sure how to implement them? Check out this demo.
Demo instructions
Explore the code and find out how to implement callouts in different formats.
JointJS – Callouts

See the Pen JointJS: Callouts by JointJS (@jointjs) on CodePen.

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Made with JointJS

Available in the JointJS open-source library which helps developers create simple visual applications in less time.

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Leverage a time-tested JavaScript diagramming library using the best of HTML5 and SVG to accelerate your development.