html
var p = new URLSearchParams(window.location.search);
var u = p.get('utm_source');
if (u) sessionStorage.setItem('utm_src', u);
var s = sessionStorage.getItem('utm_src');
if (s) {
setInterval(function() {
document.querySelectorAll('input').forEach(function(i) {
if (i.name && i.name.indexOf('utm') > -1) i.value = s;
});
}, 500);
}
