<html>
<body>
Search: <input type="search" id="mySearch">
<p>Click the button to set the search field to read-only.</p>
<p><strong>Tip:</strong> To see the effect, try to type something in the search field before and after clicking the button.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("mySearch").readOnly = true;
}
</script>
</body>
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</html>