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Style all <input> elements with an invalid value with CSS
To style all <input> elements with an invalid value, use the CSS :invalid selector.
Example
You can try to run the following code to implement the :invalid selector −
<!DOCTYPE html>
<html>
<head>
<style>
input:invalid {
background: red;
}
</style>
</head>
<body>
<h2>Heading</h2>
<input type = "email" value = "InvalidEmail">
<p>The style (red color background) appears if you type an irrelevant/ invalid email address.</p>
</body>
</html> 
Updated on: 2020-06-30T11:13:45+05:30
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