Thank you for pointing out contentvisibilityautostatechanged, I was aware of `content-visibility` but didn't know that it has an associated event. I'm less sure

Thank you for pointing out contentvisibilityautostatechanged, I was aware of `content-visibility` but didn't know that it has an associated event. I'm less sure about CSS compatibility, hotlink.js for example used an iframe which opens a whole can of worms.