I want to make a timeline for a website that scrolls from left to right as you scroll down the page. How do I do that? I am using Wix Editor
Horizontal scroll is not possible in the classic editor.
You can achieve that using the new Wix Studio editor.
You can try to search for the Velo code to create a progress bar in wix for reference. This is just a suggestion~
In case it helps, this the kind of effect I am going for (scroll down from this page)
If using Studio, I think this is what you’re looking for 
That’s awesome, thanks so much!
Is it impossible in the free version?
Definitely possible in the free version!
This is not true.
It is possible to generate a Horizontal Scroll also in the ordinary Wix-Editor.
Of course it is not a 100% completely horizontal scrolling, but can simulate 99% of the function.
All you need is a CUSTOM-ELEMENT or HTML-Component + some very tricky coding.