<button onclick="console.log('click')">Click me!!!</button><input type="text" id="dt" value="" required oninvalid="setCustomValidity('Please enter e value to process!!')" oninput="setCustomValidity('')" >
<input type='button' value="Save" onclick="processRequest(document.getElementById('dt').value)">
<script>
window.onload=(()=>{document.querySelector("input[id='dt']").value=(new Date()).getFullYear();});
processRequest=((val)=>{
alert(val);
});
</script><head>
<script>
function x(y)
{
const q = document.getElementById(y);
alert(q.innerHTML);
}
</script>
</head>
<body>
<button id="btn" onclick="x('thing')">Press </button>
<div id="thing"> HELLO WORLD</div>