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Does gsap.to(...) animate from the current value or resets it before animating?

mmetahero test
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I got animation like in the video attached that is triggered via the code below:

// tab is the html div object of the clicked tab button
// blue line is the html div object of the line below the buttons
gsap.to(
      blueLine,
      {
         duration: 0.5,
         left: tab.offsetLeft,
         width: tab.offsetWidth,
         overwrite: false,
         lazy: false
      }
)

As you can see on the video it looks like gsap is resetting the "left" property to 0 and animates it from there.

Is there a way to not reset the value and instead animate from the current property value?

I couldn't find anything about it in the docs or forum.

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It's pretty tough to troubleshoot without a minimal demo - the issue could be caused by CSS, markup, a third party library, your browser, an external script that's totally unrelated to GSAP, etc. Would you please provide a very simple CodePen or CodeSandbox that demonstrates the issue? 

 

Please don't include your whole project. Just some colored <div> elements and the GSAP code is best (avoid frameworks if possible). See if you can recreate the issue with as few dependancies as possible. If not, incrementally add code bit by bit until it breaks. Usually people solve their own issues during this process! If not, then at least we have a reduced test case which greatly increases your chances of getting a relevant answer.

 

Here's a starter CodePen that loads all the plugins. Just click "fork" at the bottom right and make your minimal demo

See the Pen aYYOdN by GreenSock (@GreenSock) on CodePen

 

If you're using something like React/Next/Vue/Nuxt or some other framework, you may find StackBlitz easier to use. We have a series of collections with different templates for you to get started on these different frameworks: React/Next/Vue/Nuxt.

 

Once we see an isolated demo, we'll do our best to jump in and help with your GSAP-specific questions. 

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