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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>