<!DOCTYPE HTML>
<html>
<head>
</head>
<body>
<div id="test">Click/tap me</div>
<script>
var el = document.getElementById('test');
var valueSettableByTest = 0;
var valueToTest = 0;
el.addEventListener('click', function() {
  valueToTest = valueSettableByTest;
});
</script>
</body>
</html>