Frontend & browser·Browser security
you opened a link in a new tab and the other site could reach back and navigate the tab you came from.
noopener
Also calledrel=noopener, tabnabbing
A link relation preventing the opened page from receiving a `window.opener` reference to yours. Without it, the destination can redirect your original tab to a phishing page while the user is looking elsewhere. Browsers now imply it for `target="_blank"`, but any window opened by script still needs it explicitly.