IntersectionObserver experimental support in iOS?

[LordPachelbel]

IntersectionObserver is enabled by default in iOS Safari's Experimental Features list, but it doesn't seem to work in a Cordova app:

let observer = new IntersectionObserver(entries => {
  if (entries[0].boundingClientRect.y < 0) {
    document.body.classList.add("header-not-at-top");
  } else {
    document.body.classList.remove("header-not-at-top");
  }
});
observer.observe(document.querySelector("#top-of-site-pixel-anchor"));

The new line throws an exception: ReferenceError: Can't find variable: IntersectionObserver

It probably doesn't work for the same reason WebGL2 stuff doesn't work, right?

[breautek]

It probably doesn't work for the same reason WebGL2 stuff doesn't work, right?

Correct, experimental features are not enabled in app webviews, so they cannot be used.