Thanks @FlorianMaak! But it looks to me as though the unprefixed fullscreenElement is not yet available everywhere - perhaps only 45%? In some of our other packages we use fscreen to normalize this.

Thanks very much for the PR @FlorianMaak - beyond browser support, it would be nice to write a test in the dragelement_test.js suite to lock down your fix. Would be interested in attempting to write a test?

Sure. Going to migrate to fscreen and add tests as soon, as I'm at office tomorrow.

Relating Tests: I think, we need to edit the karma config to work with fullscreen. Per default karma does not support fullscreen mode :/

karma-runner/karma#2292

I think, we need to edit the karma config to work with fullscreen. Per default karma does not support fullscreen mode :/

Right, writing a "real" test for fullscreen might be difficult and quite frankly not necessary.

That said, if should be possible to test the new logic using jasmine spies.

I'll be offline for the next two weeks, but @archmoj should be able to help you out if you run into problems.

... and as for the failing tests. Merging master post #4321 should make them go green ✅ again. Sorry for the inconvenience

@FlorianMaak could you please merge master into this branch and resolve the conflict?

This pull request has been sitting for a while, so I would like to close it as part of our effort to tidy up our public repositories. I've assigned it to myself to keep track of it; I'll wait until 2024-06-17 for someone to say it's still relevant and they'll to take it on, and otherwise I will close it then. Thanks - @gvwilson