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Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The SyncEvent interface represents a sync action that is dispatched on the ServiceWorkerGlobalScope of a ServiceWorker. 

This interface inherits from the ExtendableEvent interface.

Constructor

SyncEvent.SyncEvent()
Creates a new SyncEvent object.

Properties

Inherits properties from its ancestor, Event.

SyncEvent.tag Read only
Returns the developer-defined identifier for this SyncEvent.
SyncEvent.lastChance Read only
Returns true if the user agent will not make further synchronization attempts after the current attempt.

Methods

Inherits methods from its parent, ExtendableEvent

None.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Basic support
ExperimentalNon-standard
Chrome Full support 49Edge ? Firefox ? IE ? Opera ? Safari ? WebView Android No support NoChrome Android Full support 49Edge Mobile ? Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
SyncEvent() constructor
ExperimentalNon-standard
Chrome Full support 49Edge ? Firefox ? IE ? Opera ? Safari ? WebView Android No support NoChrome Android Full support 49Edge Mobile ? Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
tag
ExperimentalNon-standard
Chrome Full support 49Edge ? Firefox ? IE ? Opera ? Safari ? WebView Android No support NoChrome Android Full support 49Edge Mobile ? Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support 5.0
lastChance
ExperimentalNon-standard
Chrome Full support 49Edge ? Firefox ? IE ? Opera ? Safari ? WebView Android No support NoChrome Android Full support 49Edge Mobile ? Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android Full support 5.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.
Non-standard. Expect poor cross-browser support.

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