Passive Listening

var timeStampInMs = window.performance && window.performance.now && window.performance.timing && window.performance.timing.navigationStart ? window.performance.now() + window.performance.timing.navigationStart : Date.now(); document.getElementById("is_validation").value = timeStampInMs; for(var i = 0; i < document.forms.length; i++) {var form = document.forms[i];for (var j = 0; j < form.elements.length; j++) {var element = form.elements[j];if (element.type == 'hidden' && element.name == 'is_version') {var input = document.createElement('input');input.type = 'hidden';input.id = 'timeZone';input.name = 'timeZone';input.value = Intl.DateTimeFormat().resolvedOptions().timeZone;form.appendChild(input);}}}