Img
by Kumaresan S
HTML
<img src="https://developer.salesforce.com/resource/images/salesforce-developer-network-logo_1.png" alt="Smiley face">
<div onclick="setAtt()">
click
</div>
<script>
function setAtt(){
//alert("test");
var img = document.getElementById("test");
img.setAttribute('width', 20%);
img.setAttribute('height', 20%);
}
</script>