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/HTML

rel=noopener

The noopener keyword for the rel attribute of the <a>, <area>, and <form> elements instructs the browser to navigate to the target resource without granting the new browsing context access to the document that opened it — by not setting the Window.opener property on the opened window (it returns null).

This is especially useful when opening untrusted links, in order to ensure they cannot tamper with the originating document via the Window.opener property (see About rel=noopener for more details), while still providing the Referer HTTP header (unless noreferrer is used as well).

Note that when noopener is used, nonempty target names other than _top, _self, and _parent are all treated like _blank in terms of deciding whether to open a new window/tab.

Note: Setting target="_blank" on <a> elements now implicitly provides the same rel behavior as setting rel="noopener" which does not set window.opener. See browser compatibility for support status.

Specifications

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
noopener 49 79
52Before Firefox 63, rel="noopener" created windows with all features disabled by default. Starting with Firefox 63, these windows have the same features enabled by default as any other window.
No 36 10.1 49 49
52Before Firefox 63, rel="noopener" created windows with all features disabled by default. Starting with Firefox 63, these windows have the same features enabled by default as any other window.
36 10.3 5.0

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https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes/rel/noopener