That actually has nothing to do with the modifiers or utils. It has to do with the += that I have in the target i value  Remove that and it works: See the Pen VweybzG?editors=0010 by GreenSock (@GreenSock) on CodePen   The .wrap() documentation will provide a more thorough explanation than me  Feel free to ask if you have questions.   Yep! It's one of the core plugins. You can see an overview of what is and isn't in GSAP's core on the
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