<!DOCTYPE html>
<html>
<head>
<style>
input:out-of-range {
border: 2px solid red;
}
</style>
</head>
<body>
<h3>A demonstration of the :out-of-range selector.</h3>
<input type="number" min="5" max="10" value="17">
<p>Try typing a number within the given range (between 5 and 10), to see the styling disappear.</p>
<p><strong>Note</strong>: The :out-of-range selector is not supported in Internet Explorer.</p>
</body>
</html>