CloseWatcherLimited availability
The CloseWatcher API listens and responds to close requests on in-page components, such as modals, popovers, and sidebars.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–125Not supported
126+Supportedsince Jun 11, 2024
Current: 155Edge
12–125Not supported
126+Supportedsince Jun 13, 2024
Current: 154Firefox
1–148Not supported
149+Supportedsince Mar 24, 2026
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–125Not supported
126+Supportedsince Jun 11, 2024
Current: 155Firefox Android
4–148Not supported
149+Supportedsince Mar 24, 2026
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Safari, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: CloseWatcher.
Feature detection
JS · check before using
if ("CloseWatcher" in globalThis) {
// CloseWatcher is available
} else {
// load a polyfill or use a fallback
}Sub-features
Support for each part of the feature (7). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| CloseWatcher | 126 | 126 | 149 | ✕ | 126 | 149 | ✕ |
| CloseWatcher.CloseWatcher | 126 | 126 | 149 | ✕ | 126 | 149 | ✕ |
| CloseWatcher.cancel_event | 126 | 126 | 149 | ✕ | 126 | 149 | ✕ |
| CloseWatcher.close | 126 | 126 | 149 | ✕ | 126 | 149 | ✕ |
| CloseWatcher.close_event | 126 | 126 | 149 | ✕ | 126 | 149 | ✕ |
| CloseWatcher.destroy | 126 | 126 | 149 | ✕ | 126 | 149 | ✕ |
| CloseWatcher.requestClose | 126 | 126 | 149 | ✕ | 126 | 149 | ✕ |