BASELINE NowYouCanUse.com
Limited Availability

CloseWatcher

The CloseWatcher API listens and responds to close requests on in-page components, such as modals, popovers, and sidebars.
Baseline Status: This feature is currently Limited (not yet Baseline). Latest engine implementation shipped on Mar 24, 2026.
Desktop Browser Engine Support
Google Chrome
126
Supported
Mozilla Firefox
149
Supported
Apple Safari
—
Unsupported
Microsoft Edge
126
Supported
Mobile Browser Engine Support
Chrome Android
126
Firefox Android
149
Safari iOS
—
Specifications and References
Specification ↗ Feature XML ↗
MDN Browser Compat Data Keys:
api.CloseWatcher ↗ api.CloseWatcher.CloseWatcher ↗ api.CloseWatcher.cancel_event ↗ api.CloseWatcher.close ↗ api.CloseWatcher.close_event ↗ api.CloseWatcher.destroy ↗ api.CloseWatcher.requestClose ↗
id: closewatcher