JavaScript

Sep 24, 2025 · Frontend Development

How to Detect Page Visibility and Safely Handle Unload Events in Modern Web Apps

Understanding when users leave or hide a page is crucial for UX, analytics, and performance; this guide explains the Page Visibility API, beforeunload/unload events, the sendBeacon method, and pagehide/pageshow handling, offering code examples and best‑practice recommendations for reliable detection and data reporting.