I have a standard youtube embed iframe from a random video:
<iframe width="560" height="315"src="https://www.youtube.com/embed/ixJ5NbvXg_A" frameborder="0"allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"allowfullscreen></iframe>I duplicated this a couple of times to get some scroll overflow.
<html><head></head><body><iframe width="560" height="315" src="https://www.youtube.com/embed/Mm2eYfj0SgA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe><iframe width="560" height="315" src="https://www.youtube.com/embed/Mm2eYfj0SgA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe><iframe width="560" height="315" src="https://www.youtube.com/embed/Mm2eYfj0SgA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe><iframe width="560" height="315" src="https://www.youtube.com/embed/Mm2eYfj0SgA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe><iframe width="560" height="315" src="https://www.youtube.com/embed/Mm2eYfj0SgA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe><iframe width="560" height="315" src="https://www.youtube.com/embed/Mm2eYfj0SgA" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen=""></iframe></body></html>When I serve this using django server on localhost the iframes prevent the page scroll.
When you move your cursor over a video and then use the mousewheel to scroll, it does not work.
The really funny thing is that when I paste the same code and save it to a local file on desktop. Then open it with chrome, the scroll works over youtube videos.
I checked in developer tools, the file served has exactly the same HTML.There is 100% no CSS or Javascript served, there are no templates, nothing. There is only a simple html file in both cases.
Version 71.0.3578.98 (Official Build) (64-bit)