使用CSS：out-of-range选择器设置<input>元素的样式，使其值超出指定范围。
您可以尝试运行以下代码来实现：out-of-range选择器
<!DOCTYPE html>
<html>
<head>
<style>
input:out-of-range {
border: 3px dashed orange;
background: yellow;
}
</style>
</head>
<body>
<input type = "number" min = "5" max = "10" value = "15">
<p>The style only works for the value entered out of range</p>
</body>
</html>