<!DOCTYPE html>
<html>
<head>
<title>Title of the Document</title>
</head>
<body>
<input type="text" placeholder="Type " id="inputId" class="inputClass">
<button type="button" onclick="getInputValue();">Get Value</button>
<script>
function getInputValue() {
// Selecting the input element and get its value
let inputVal = document.getElementsByClassName("inputClass")[0].value;
// Displaying the value
alert(inputVal);
}
</script>
</body>
</html>