Update index.md

files/en-us/web/http/headers/cross-origin-opener-policy/index.md

@@ -11,7 +11,8 @@ The HTTP **`Cross-Origin-Opener-Policy`** (COOP) response header allows you to e
 
 COOP will process-isolate your document and potential attackers can't access your global object if they were to open it in a popup, preventing a set of cross-origin attacks dubbed [XS-Leaks](https://github.com/xsleaks/xsleaks).
 
-If a cross-origin document with COOP is opened in a new window, the opening document will not have a reference to it, and the [`window.opener`](/en-US/docs/Web/API/Window/opener) property of the new window will be `null`. This allows you to have more control over references to a window than [`rel=noopener`](/en-US/docs/Web/HTML/Attributes/rel/noopener), which only affects outgoing navigations.
+If a cross-origin document with COOP is opened in a new window, the opening document will not have a reference to it, and the [`window.opener`](/en-US/docs/Web/API/Window/opener) property of the new window will be `null`.
+This allows you to have more control over references to a window than [`rel=noopener`](/en-US/docs/Web/HTML/Attributes/rel/noopener), which only affects outgoing navigations.
 
 <table class="properties">
   <tbody>