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Does anyone know how to achieve this text mask effect?

Hey everyone!

I’ve seen this text masking effect on a ton of Awwwards websites, but I can’t seem to find out what they’re using or a tutorial explaining how to achieve this effect. It looks like GSAP but I’m not sure. Anyone have an idea?

I know you can do this in Webflow using overflow hidden divs for each span line, but that seems redundant. I looked in their code and it seems like they’re just animating all text like that that fall in a certain DIV.

Here’s a site using it for their main heading text.

Here’s a clip of it: