I think that they are wasting: and the buttons are created, no matter if they are gone or visible, or are they outside the screen area at all, and are the pictures loaded?
Do I understand correctly?

    1 answer 1

    In general, yes, but there are nuances. A YouTube video, for example, does not load if it is in a div with display: none;

    • Thank you, is there an algorithm for checking whether an element in the scope is included or not? - lmihael
    • Of course there is. Ask a question, and I will post the answer to jQuery - KAGG Design