https://wingassistant.com/wp-content/plugins/utm-tracker-for-contact-form-7/js/utm-tracker.js?ver=1.5

1(function() {
2    var keys = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_id', 'utm_term', 'utm_content'];
3
4    // Store UTM to sessionStorage
5    if (window.location.search) {
6        var params = new URLSearchParams(window.location.search);
7        keys.forEach(function(key) {
8            if (params.has(key)) {
9                sessionStorage.setItem(key, params.get(key));
10            }
11        });
12    }
13
14    // Restore UTM if cookies missing
15    keys.forEach(function(key) {
16        if (!document.cookie.includes(key + '=')) {
17            var val = sessionStorage.getItem(key);
18            if (val) {
19                var expires = new Date();
20                expires.setTime(expires.getTime() + 30 * 24 * 60 * 60 * 1000);
21                document.cookie = key + '=' + encodeURIComponent(val) + ';path=/;expires=' + expires.toUTCString();
22            }
23        }
24    });
25})();