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<!DOCTYPE html> <html> <head> <style> input:focus { background-color: yellow; } </style> </head> <body> <h1>Demo of the :focus selector</h1> <p>Click inside the text fields to see a yellow background:</p> <form> First name: <input type="text" name="firstname"><br> Last name: <input type="text" name="lastname"> </form> </body> </html>