IntesectionObserver fails to fire event upon horizontal scrolling on small screen

[anatsarig]

When laying elements horizontally (with horizontal scroll bar), and scrolling left/right,
IntersectionObserver does not always fire event when an observed element enters the viewport.
This happens on mobile devices or when testing on desktop chrome while setting small dimensions or Responsive screen or mobile screens (iPhone 6/7/8 etc.)

Is there a way to overcome this ?
Thank you

[eduardmarcinov]

I have same issue on Safara 11.1. Any way how to solve this? Thank you

[szager-chromium]

This is most likely related to issue #266. If the layout viewport is bigger than the visual viewport, then IntersectionObserver won't send notifications when objects move on or off the screen.

This is not unique to horizontal scrolling; it should affect vertical scrolling the same way.

[anatsarig]

Will it be fixed in the near future ? Thank you

[bruscantini]

I'd also like to know. I'm having issues on safari probably because it's not using the visual viewport. Why can't we have it as an option?

[leonardojimenez]

+1, getting same issue on Chrome as well

[miketaylr]

Given #301 (comment), let's close this issue as a duplicate. If someone has a reduced test case to show it's different, please command and we can re-open.