Element offsetTop Property

<div id="test">
<p>Click the button to get offsetTop for the test div.</p>
<p><button onclick="myFunction()">Try it</button></p>
<p>offsetTop is: <span id="demo"></span></p>
</div>

<script>
function myFunction() {
    var testDiv = document.getElementById("test");
    document.getElementById("demo").innerHTML = testDiv.offsetTop;
}
</script>

<div id="test">
<p>Click the button to get the left and top offsets for the test div.</p>
<p><button onclick="myFunction()">Try it</button></p>
<p id="demo">offsetLeft: <br>offsetTop: </p>
</div>
<script>
function myFunction() {
    var testDiv = document.getElementById("test");
    var demoDiv = document.getElementById("demo");
    demoDiv.innerHTML = "offsetLeft: " + testDiv.offsetLeft + "<br>offsetTop: " + testDiv.offsetTop;
}
</script>