The Window interface's opener property returns a reference to the window that opened the window using open().

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


openerWindow = window.opener;


A Window referring to the window that called open() to open the current window, or null if this window was not opened by being linked to or created by another.

In some browsers, a rel="noopener noreferrer" attribute on the originating <a> element will prevent the window.opener reference from being set, in which case this property will return null.


if (window.opener != indexWin) {

Usage notes

When a window is opened from another window (using or a link with its target attribute set), it maintains a reference to that first window as window.opener. If the current window has no opener, this method returns null.

Browser compatibility

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ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
openerChrome Full support YesEdge Full support 12Firefox Full support YesIE ? Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes


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Full support
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Compatibility unknown