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Preloader line!

How do I make a simple preloader line that shows (or mimics) the progress of my page loading? Just one line that lengthens from 0% to 100% for intance.

I made some test preloader interactions, but don’t know how to make one that starts When page starts loading and ends When page finishes loading
Now I just have a slogan there on a black background that dissappears when Page finishes loading.

Here is my public share link:

Thank you,