We are currently using RunningBoard on iOS (and soon macOS) to throttle WebContent processes. At its most throttled state a WebContent process will have a CPU priority of DARWIN_BG but will still be running. We should fully suspend background WebContent processes behind a new runtime flag.
<rdar://problem/101001791>
Pull request: https://github.com/WebKit/WebKit/pull/5212
Committed 255498@main (4bd642c8073d): <https://commits.webkit.org/255498@main> Reviewed commits have been landed. Closing PR #5212 and removing active labels.