visibilitychange: Ever wondered how your browser knows when you leave a tab?

DEV CommunityTuesday, November 4, 2025 at 5:21:33 PM
Have you ever wondered how your browser knows when you leave a tab? Thanks to the Page Visibility API and the visibilitychange event, web pages can detect when they're visible to users. This means that videos or animations pause when you switch tabs and resume automatically when you return. This feature enhances user experience by ensuring that content is only active when you're engaged, making browsing smoother and more efficient.
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