It is necessary to make a similar menu, according to the functionality. What would the main section open when scrolling and show which subsection you are on, and also when you move to the next section, the previous section closes.

here is an example link to an example

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also fixed. in which direction should I look for the answer to my question.

Closed due to the fact that off-topic participants Sasha Omelchenko , AK ♦ , Mr. Black , Jarvis_J , 0xdb Jun 28 '18 at 23:50 .

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1 answer 1

In the example, the ScrollSpy component from Bootstrap is most likely used. Here's a look - it is also used on the bootstrap site, in the example even the look is very similar.