https://www.logogenio.pt/js/disable-password-autocomplete.js

1(function () {
2    'use strict';
3
4    var PASSWORD_SELECTOR = 'input[type="password"], input[name="password"], input[name="confirm_password"], input[name="new_password"]';
5
6    function disablePasswordAutocomplete(input) {
7        if (!input || input.nodeName !== 'INPUT') {
8            return;
9        }
10        input.setAttribute('autocomplete', 'off');
11        input.setAttribute('autocorrect', 'off');
12        input.setAttribute('autocapitalize', 'off');
13        input.setAttribute('spellcheck', 'false');
14    }
15
16    function applyToRoot(root) {
17        var scope = root || document;
18        if (!scope.querySelectorAll) {
19            return;
20        }
21        var inputs = scope.querySelectorAll(PASSWORD_SELECTOR);
22        for (var i = 0; i < inputs.length; i++) {
23            disablePasswordAutocomplete(inputs[i]);
24        }
25    }
26
27    function onReady() {
28        applyToRoot(document);
29
30        if (typeof MutationObserver === 'undefined' || !document.body) {
31            return;
32        }
33
34        new MutationObserver(function (mutations) {
35            for (var i = 0; i < mutations.length; i++) {
36                var nodes = mutations[i].addedNodes;
37                for (var j = 0; j < nodes.length; j++) {
38                    var node = nodes[j];
39                    if (node.nodeType !== 1) {
40                        continue;
41                    }
42                    if (node.matches && node.matches(PASSWORD_SELECTOR)) {
43                        disablePasswordAutocomplete(node);
44                    }
45                    applyToRoot(node);
46                }
47            }
48        }).observe(document.body, { childList: true, subtree: true });
49    }
50
51    if (document.readyState === 'loading') {
52        document.addEventListener('DOMContentLoaded', onReady);
53    } else {
54        onReady();
55    }
56
57    document.addEventListener('focus', function (e) {
58        var target = e.target;
59        if (!target || target.nodeName !== 'INPUT') {
60            return;
61        }
62        if (target.type === 'password' || target.name === 'password' || target.name === 'confirm_password' || target.name === 'new_password') {
63            disablePasswordAutocomplete(target);
64        }
65    }, true);
66})();