Source Code:
(back to article)
Submit
Result:
Report an issue
<!DOCTYPE html> <html> <head> <title>Title of the document</title> <style> input:invalid { border: 2px solid #ff0000; } </style> </head> <body> <h2>:invalid selector example</h2> <form> <input type="email" value="E-mail"> </form> </body> </html>