Specific apps have an option under
Float on Top which allows this kind of behavior:
The problem is that I'd like to achieve this on all windows. Specifically I'd like to choose specific windows say of Chrome and do this. I'd like a video-player floating on top (and always staying on top even as I switch to other apps). But I'd like other windows in Chrome (say my email) to also be on top. I cannot seem to achieve this anywhere and it's a bit frustrating to not have this simple customization.
Any help would be greatly appreciated 🙂
EDIT to be more specific I'm looking to be able to pick and choose any window from any app and make it float. This is already achievable by the Notes and Stickies native apps so this functionality exists within the OS. You can just open both apps and select Window->Float on Top. They will keep floating above other apps. I'd just like for this functionality to be available across all apps.