To mitigate "tab-napping" attacks, in which a new tab/window opened by a victim context may navigate that opener context, the HTML standard changed to specify that anchors that target _blank should behave as if |rel="noopener"| is set. A page wishing to opt out of this behavior may set |rel="opener"|.
To mitigate "tab-napping" attacks, in which a new tab/window opened by a victim context may navigate that opener context, the HTML standard changed to specify that anchors that target _blank should behave as if |rel="noopener"| is set. A page wishing to opt out of this behavior may set |rel="opener"|. https://html.spec.whatwg.org/#following-hyperlinks To get an element's noopener, given an a, area, or form element element and a string target, run these steps: ... If element's link types do not include the opener keyword and target is an ASCII case-insensitive match for "_blank", then return true. ...
Explainers: https://html.spec.whatwg.org/#following-hyperlinks