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

[ampburner]

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

Elusive Target #5: The Gunrunner

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.

[codinghorror (Jeff Atwood)]

Covered here

Youtube One-Box cannot maximize

I was able to reproduce and what seems to be happening is Chrome briefly resizes the discourse window beneath to fullscreen before applying the video. I’m pretty sure it’s this bug which has been around for over a year In terms of a workaround, I don’t think there’s anything we can do as the fullscreen code is triggered within the iframe, which is outside of our security context.