This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The SyncEvent.tag read-only property of the SyncEvent interface returns the developer-defined identifier for this SyncEvent. This is the value passed in the tag parameter of the SyncEvent() constructor.
var tag = SyncEvent.tag
The developer-defined identifier for this SyncEvent.
| Specification | Status | Comment |
|---|---|---|
| Web Background Synchronization The definition of 'tag' in that specification. | Living Standard | Initial definition. |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 49 | ? | ? | ? | ? | ? |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | No | 49 | ? | ? | ? | ? | 5.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/SyncEvent/tag