Power-Ups make use of a suite of capabilites and Client Library that are documented here.
If you're getting started, we recommend heading over to the Your First Power-Up guide to get started. When ready, come back to this reference section for a deeper dive into the various capabilities and UI elements provided by the Power-Up client library.
Whether you're a seasoned Power-Up developer or just getting started, we recommend checking out our topical videos where the Trello team dives into topics relevant to Power-Up developers:
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