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The isTrusted read-only property of the Event interface is a boolean that is true when the event was generated by a user action, and false when the event was created or modified by a script or dispatched via dispatchEvent.


var bool = event.isTrusted;


 if (e.isTrusted) {
     /* The event is trusted. */
 } else {
     /* The event is not trusted. */


Specification Status Comment
The definition of 'Event.isTrusted' in that specification.
Living Standard  
Document Object Model (DOM) Level 3 Events Specification
The definition of 'Trusted events' in that specification.
Obsolete Adds requirements regarding trusted and untrusted events, though it does not itself define the isTrusted property.

Browser compatibility

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Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 46.0 [1] (Yes) (Yes) No support [2] 33 No support
Feature Android Android Webview Edge Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? 46.0 [1] (Yes) (Yes) ? ? 33 No support 46.0 [1]

[1] Starting with Chrome 53, untrusted events do not invoke the default action. 

[2] In Internet Explorer, all events are trusted except those that are created with the createEvent() method.

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