Page lifecycleLimited availability
The page lifecycle API helps you safely handle page suspensions or discards from memory. The freeze and resume events fire when the browser suspends or resumes a page from memory while the document.wasDiscarded property reports whether the page was reloaded after being dropped.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–67Not supported
68+Supportedsince Jul 24, 2018
Current: 155Edge
12–18Not supported
79+Supportedsince Jan 15, 2020
Current: 154Firefox
✕Not supportedup to 157
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–67Not supported
68+Supportedsince Jul 24, 2018
Current: 155Firefox Android
✕Not supportedup to 157
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Firefox, Safari, Firefox Android, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN — see the links below.
Feature detection
JS · check before using
if ("onfreeze" in Document.prototype) {
// the freeze event is supported
}Specification
Sub-features
Support for each part of the feature (3). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| Document.freeze_event | 68 | 79 | ✕ | ✕ | 68 | ✕ | ✕ |
| Document.resume_event | 68 | 79 | ✕ | ✕ | 68 | ✕ | ✕ |
| Document.wasDiscarded | 68 | 79 | ✕ | ✕ | 68 | ✕ | ✕ |