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Role of CSS :required Selector
Use the CSS :required selector to style <input> elements with a "required" attribute. You can try to run the following code to implement the :required selector:
Example
<!DOCTYPE html>
<html>
<head>
<style>
input:required {
background-color: orange;
}
</style>
</head>
<body>
<form>
Subject: <input type = "text" name = "subject" value = "C++"><br>
Student: <input type = "text" name = "student" value = "Amit" required><br>
</form>
</body>
</html>
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