使用CSS：read-write选择器选择“可读”和“可写”的元素。
您可以尝试运行以下代码来实现：read-write选择器：
<!DOCTYPE html>
<html>
<head>
<style>
input:read-write {
background-color: blue;
color: white;
}
</style>
</head>
<body>
<form>
Subject: <input type = "text" name = "subject" value = "Java"><br>
Student: <input type = "text" name = "student" readonly value = "Amit"><br>
</form>
</body>
</html>