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Navigator: webdriver property

The webdriver read-only property of the navigator interface indicates whether the user agent is controlled by automation.

It defines a standard way for co-operating user agents to inform the document that it is controlled by WebDriver, for example, so that alternate code paths can be triggered during automation.

The navigator.webdriver property is true when in:

Chrome

The --enable-automation or the --headless flag or the --remote-debugging-port is used.

Firefox

The marionette.enabled preference or --marionette flag is passed.

Value

A Boolean

Specifications

Specification
WebDriver
# dfn-webdriver

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
webdriver 63 12 60 11 50 10.1 63 63 60 46 10.3 8.0

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https://developer.mozilla.org/en-US/docs/Web/API/Navigator/webdriver