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'Dawnie' used to say, "It's really quite simple: Be kind, and the rest takes care of itself. Never do anything that's not kind".

Dawn Atherton

::backdrop

The ::backdrop CSS pseudo-element is a box the size of the viewport which is rendered immediately beneath any element being presented in fullscreen mode. This includes both elements which have been placed in fullscreen mode using the Fullscreen API and <dialog> elements.
::backdrop css reference