Run ❯
<!DOCTYPE html> <html> <head> <style> #firstname { background-color: yellow; } </style> </head> <body> <h1>Demo of the #id selector</h1> <div class="intro"> <p id="firstname">My name is Donald.</p> <p id="hometown">I live in Duckburg.</p> </div> <p>My best friend is Mickey.</p> </body> </html>