rel=noopener

<a>、<area> 和 <form> 元素的 rel 属性的 noopener 关键字指示浏览器导航到目标资源，而不授予新的浏览上下文访问打开它的文档的权限 - 通过不在打开的窗口上设置 Window.opener 属性（ 它返回 null)。

¥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).

这在打开不受信任的链接时特别有用，以确保它们无法通过 Window.opener 属性篡改原始文档（有关更多详细信息，请参阅 关于 rel=noopener），同时仍然提供 Referer HTTP 标头（除非也使用 noreferrer）。

¥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).

请注意，当使用 noopener 时，除了 _top、_self 和 _parent 之外的非空目标名称在决定是否打开新窗口/选项卡方面都将被视为 _blank。

¥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.

注意：现在，在 <a> 元素上设置 target="_blank" 隐式提供与设置 rel="noopener"（不设置 window.opener）相同的 rel 行为。请参阅 浏览器兼容性 了解支持状态。

¥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