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The read-only id property of the ContentIndexEvent interface is a String which identifies the deleted content index via it's id.


var id =;


A String representation of the deleted content index id.


This example listens for the contentdelete event and logs the removed content index id.

The ContentIndexEvent is only available to the global scope of a ServiceWorker.

self.addEventListener('contentdelete', (event) => {

  // logs content index id, which can then be used to determine what content to delete from your cache



Specification Status Comment
Content Index API
The definition of 'id' in that specification.
Editor's Draft Initial definition.

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See also