What dose mean this "style="--i:;"

Hello! everyone
some one tell what dose mean this
I know is use it in animation CSS “–i:1;”
but i need more explanation .
thank you
have I nice day

I’m no expert…

But that just looks like a CSS variable. It might be used in an animation but I don’t think it is specific to animation. I think we’d have to see more code to really understand.

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it is the firest time i see this it is looks like class but it is css variable
I saw that in animation CSS tutorial