We iterate over all parts of the page.
For each part we calculate
part.offset().top, which means y coordinate on page where element starts. If it is less than
scrollTop. It means we have scrolled past this part of page and it is time to highlight it’s link. and we keep the last part to which we have scrolledTo.
offset().top of any part is less than
scrollTop. We keep last part.
Then we remove active class from all links and add active class to link of the part we kept.
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