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white lines with firefox

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This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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Since last Firefox upgrade something really extrange started to happen.

Take a look at the image.


The web has white background.

I have the buttons and some lines animated behind.

Well, when the lines fade in behind the rectangle buttons, the background turns black except for some areas that remain white.

After the fade in finishes, background goes back to white, and everything works fine from now.

This only happens in Firefox (not Safary, not Chrome).


Do you know what could cause this behaviour?


Thanks in advance



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Hi Fernando,


It would be very helpful if you could provide a live sample (fiddle or codepen) of the part of your code that's behaving like this in order to take a look at it.




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