Web features explorer

CloseWatcher

Limited availability

The CloseWatcher API listens and responds to close requests on in-page components, such as modals, popovers, and sidebars.

Browser support

  • Chrome 126 Released on 2024-06-11
  • Chrome Android 126 Released on 2024-06-11
  • Edge 126 Released on 2024-06-13
  • Firefox 149 Released on 2026-03-24
  • Firefox for Android 149 Released on 2026-03-24
  • Safari Not supported Position: neutral
  • Safari on iOS Not supported Position: neutral

Baseline availability blocked since March 2026 by Safari (4 months)

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MDN documentation

Specifications

Usage (according to Chrome Platform Status)

~0.051% of page loads. More data at chromestatus.com.

Web Platform Tests (WPT)

View the latest WPT test results for this feature

View as JSON | Edit this feature | Report an issue | Web-features entry: source, dist