docs/_static/js/external-urls.js

// Copyright (c) 2009 Giampaolo Rodola. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Open all external URLs in a new tab.

document.querySelectorAll("a[href^='http']").forEach((a) => {
    if (a.hostname !== location.hostname) {
        a.target = "_blank";
        a.rel = "noopener noreferrer";
    }
});