Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>body {
    background: #f3f3f3 url('img_tree.png');
}
</style>
</head>
<body>

<h1>Hello World!</h1>

<button type="button" onclick="myFunction()">Set background image to no-repeat</button>

<script>
function myFunction() {
    document.body.style.backgroundRepeat = "no-repeat";
}
</script>

</body>
</html>