<html>
<body>
<input type="number" id="myNumber" placeholder="Quantity">
<p>Click the button to change the placeholder text of the number field.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> input elements with type="number" are not supported in IE 9 and earlier versions.</p>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("myNumber").placeholder = "Amount";
}
</script>
</body>
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</html>