I have two use cases, that is more or less the same.
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When my doorbell (RING doorbell) is activated, I want the camera feed to pop up in a new window and show the live view of who is at the door, and then close again when the doorbell goes inactive again.
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When my alarm system is activated in “armed home” state, I have a 15 minutes timer starting before all lights are turned off. I would like to have a pop up windows displaying that timer, and then close it when the timer is finished.
I use Lovelace, is there any support or way of popping up a new windows displaying an element and them close it again from a automation or in Lovelace?