Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to return the absolute value of different numbers.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var a = Math.abs(7.25);
    var b = Math.abs(-7.25);
    var c = Math.abs(null);
    var d = Math.abs("Hello");
    var e = Math.abs(2+3);

    var x = a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e;
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>