Focus Tester
Monitor page focus and visibility APIs with live event counters, reason tracking, and render-frame timing.
Focus Verdict
Current state: focused
No unfocus reasons detected.
visibilityState: visible
document.hasFocus(): true
hidden flags:
last event: none
requestAnimationFrame Monitor
FPS: 0
ms/frame: 0
Higher ms/frame and lower FPS can indicate tab throttling or background state.
Event Counters
visibilitychange visible event 0
visibilitychange hidden event 0
webkitvisibilitychange visible event 0
webkitvisibilitychange hidden event 0
mozvisibilitychange visible event 0
mozvisibilitychange hidden event 0
pagehide event 0
mouseenter event 0
mouseleave event 0
focusin event 0
focusout event 0
focus event 0
blur event 0