Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
img {
    position: absolute;
    top: 50px;
}
</style>
</head>
<body>

<img id="myImg" src="w3javascript.gif" width="100" height="132">

<button type="button" onclick="clipImage()">Clip image</button>
<button type="button" onclick="clearClip()">Unclip image</button>

<script>
function clipImage() {
    document.getElementById("myImg").style.clip = "rect(0px 75px 75px 0px)";
}

function clearClip() {
    document.getElementById("myImg").style.clip = "auto";
}
</script>

</body>
</html>