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<!DOCTYPE html> <html> <head> <style> fieldset:invalid { border: 2px solid red; background-color: beige; } input:invalid { border: 2px solid red; background-color: beige; } </style> </head> <body> <h1>Demo of :invalid</h1> <p>Try typing a legal e-mail address to see the styling disappear.</p> <p>Also select one of the radio buttons to see the styling disappear.</p> <p>Try typing a legal numbere to see the styling disappear.</p> <form> <label for="name">Name: </label><br> <input id="name" name="name" type="text" /><br> <label for="email">Email: </label><br> <input id="email" name="email" type="email" value="supportEmail" /> <br><br> <fieldset> <legend>Select gender:</legend> <label><input name="gender" type="radio" value="male" required> Male</label> <label><input name="gender" type="radio" value="female" required> Female</label> <label><input name="gender" type="radio" value="other" required> Other</label> </fieldset> <p>Input a number between 1 and 10: <input type="number" min="1" max="10" value="17"></p> </form> </body> </html>
