Youtube fullscreen button transfers you to another post in topic (2)

I am experiencing this same issue as described here.
https://meta.discourse.org/t/youtube-fullscreen-button-transfers-you-to-another-post-in-topic/41420

The topic was locked due to “cannot reproduce” so here is some more specific information.

Reproduction scenario:

play any video in this thread and go full screen
Chrome 51.0.2704.106 m
Works in Firefox

I have found that viewport size influences the bug.
on smaller screens the functionality works fine. on large screens the bug manifests itself.

I suspect it has to do with html elements overlapping the video player in certain responsive layout states.

Covered here

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