Rotate Image using JavaScript

<img id="img" src="https://www.aspsnippets.com/Demos/SampleImages/lighthouse.jpg" alt="" />
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<input type="button" onclick="RotateImage()" value="Rotate Image" />
<script>
    function RotateImage() {
        var img = document.getElementById("img");
        var angle = 90;
        img.style.transform = "rotate(" + angle + "deg)";
    };
</script>