> It won't discard background tabs with … Active Audio/Video … partially filled forms … Thus begins a new arms race, as people who don't want their tabs discar

> It won't discard background tabs with … Active Audio/Video … partially filled forms … Thus begins a new arms race, as people who don't want their tabs discarded add hidden forms which are later modified by JS to look like they have useful new state, or adding silent single-pixel auto-playing videos, and the browser try to detect those tricks, so further tricks are devised.