The observer is finished (nearly)

Now the cover-flow has an observer that checks the position of the images and changes it styles based on that, so the images that the user is seeing is loaded while the others is hide.
It still has some bugs and space for improvements that im still figuring out how to solve, like the image loading too late on the screen or, in slow internet connections, the image takes too long to load.
Most of these bugs are because the observer (an intersectionObserver) was designed for 2d contexts, not 3d (that were and still is an giant problem to solve). For this reason i was thinking about creating an observer from scratch in C++ that can work better in my 3d element, but the overhead would be high so im trying to solve in other ways before that.
The feature was made using fetchPriority, contentVisibility and src (the system add the source just when the image is near the screen).

OBS: I found about MutationObserver after this post, maybe i will use that instead of insersectionObserver. Oh man, at least if had found about this before… Aaaaaahhhhh i spent 9 hours in that, but at least a Lot of the new logic will be used. Anyway, lets cook