The Page Visibility API provides events to know when a document becomes visible or hidden,
allowing you to pause/resume activities, save resources, and improve user experience.
Page Visibility API: checking...
👁
VISIBLE
document.visibilityState: visible
0s
Time Visible
0s
Time Hidden
0
State Changes
0
Times Hidden
Timer Demo (Pauses When Hidden)
This timer pauses when the page is hidden and resumes when visible.
Try switching to another tab or minimizing the window.
00:00:00
Timer stopped
Video Simulation (Pauses When Hidden)
Simulated video player that automatically pauses when you switch tabs.
Video paused
Use Cases
Common Applications
Pause media playback - Stop videos/audio when tab is hidden
Stop animations - Pause CSS/JS animations to save CPU
Defer updates - Skip DOM updates while hidden
Analytics - Track actual time spent viewing content
Save resources - Stop polling/WebSocket activity
Show notifications - Alert users to updates when they return
API Support
Event Log
Visibility events will be logged here...
Try switching tabs, minimizing the window, or switching to another application.