Track elements visibility

[eloquentarduino]

As it is now, impressions are tracked even when elements are not visible in the viewport ("below the fold"). I think it may be a valid metric to track, since one may want to know how many clicks/hover were performed after the element was actually visible.
I wrote a quick implementation locally which seems to be working fine. The "main" part is the JS code which looks like this:

intersectionObserver(function (entries: IntersectionObserverEntry[]): void {
 entries.forEach((entry: IntersectionObserverEntry): void => {
 const name = entry.target.getAttribute("data-pan");

 if (!name || !entry.isIntersecting || visible.includes(name))
 return;

 visible.push(name);

 queue.push({
 type: "visible",
 name: name,
 });
 })
 })

Is this something that could be integrated?

[zippgary]

this would be a better implementation of 'impression'

[zippgary]

@eloquentarduino how did you implement this?

[salernosimone]

Sorry for delay: 3311736