Target specific div / element to print

print.html

<script>
    function printDiv(divName){
        var printContents = document.getElementById(divName).innerHTML;
        document.body.innerHTML = printContents;
        window.print();
        document.body.innerHTML = originalContents;
    }
</script>

<h1>This Won't Print</h1>

<button onclick="printDiv('1')">Print #1</button>
<button onclick="printDiv('2')">Print #2</button>
<button onclick="printDiv('3')">Print #3</button>
<button onclick="printDiv('4')">Print #4</button>

<div id="1">Only print #1</div>
<div id="2">Only print #2</div>
<div id="3">Only print #3</div>
<div id="4">Only print #4</div>