The Window interface's opener property returns a reference to the window that opened the window, either with open(), or by navigating a link with a target attribute.

In other words, if window A opens window B, B.opener returns A.


const openerWindow = window.opener


A Window-like object referring to the window that opened the current window (using, or by a link with target attribute set). If this window was not opened by being linked to or created by another, returns null.

If the opener is not on the same origin as the current page, functionality of the opener object is limited. For example, variables and functions on the window object are not accessible. However, navigation of the opener window is possible, which means that the opened page can open an URL in the original tab or window. In some cases, this makes phishing attacks possible, where a trusted page that is opened in the original window is replaced by a phishing page by the newly opened page.

In the following cases, the browser does not populate window.opener, but leaves it null:

  • The opener can be omitted by specifying rel=noopener on a link, or passing noopener in the windowFeatures parameter.
  • From Firefox 79, windows opened because of links with a target of _blank don't get an opener, unless explicitly requested with rel=opener.
  • Having a Cross-Origin-Opener-Policy header with a value of same-origin prevents setting opener. Since the new window is loaded in a different browsing context, it won't have a reference to the opening window.


Specification Status Comment
HTML Living Standard
The definition of 'window.opener' in that specification.
Living Standard

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
openerChrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 9Opera Full support 3Safari Full support 1WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0


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