Yeah, plugins are great when you need to tween properties that contain more than just basic numeric values.    We offer a plugin template that has detailed comments to help you along: https://github.com/greensock/GreenSock-JS/blob/master/src/uncompressed/plugins/TEMPLATE_Plugin.js   However, if your objects have matching set and get functions like getX() / setX() or getRotation() / setRotation(), GSAP is smart enough to allow you to tween the set functions like: var message = document.get
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