<!doctype html>
<html>
<body>
<input type="text" id="myinput" onblur="checkinput()">
<script>
function checkinput() {
var input = document.getelementbyid("myinput").value;
if (input < 10) {
document.getelementbyid("myinput").style.bordercolor = "red";
} else {
document.getelementbyid("myinput").style.bordercolor = "black";
}
}
</script>
</body>
</html>
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