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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/ExtendableEvent/ExtendableEvent below:

ExtendableEvent: ExtendableEvent() constructor - Web APIs

ExtendableEvent: ExtendableEvent() constructor

Baseline Widely available

Note: This feature is only available in Service Workers.

The ExtendableEvent() constructor creates a new ExtendableEvent object.

Syntax
new ExtendableEvent(type)
new ExtendableEvent(type, options)
Parameters
type

A string with the name of the event. It is case-sensitive.

options Optional

An object that, in addition of the properties defined in Event(), can contain any custom settings that you want to apply to the event object. Currently no possible options are mandatory, but this has been defined for forward compatibility across the different derived events.

Return value

A new ExtendableEvent object.

Specifications Browser compatibility See also

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