demo · v132
What actually stops when Chrome freezes a tab?
Energy Saver freeze pauses the entire JS event loop: setTimeout, setInterval, requestAnimationFrame, and microtasks queued from network responses all stop. Four counters run side-by-side — flip the simulated freeze toggle (or hide this tab + wait) and watch every column go cold together.
listening for real freeze/resume events…
or: hide the tab + wait on a real Energy Saver machine
setTimeout chain
0
last tick: never
setInterval(250ms)
0
last tick: never
requestAnimationFrame
0
last frame: never
fetch microtask
0
last resolve: never