| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| overflow: hidden; | |
| } | |
| button#background { | |
| position: absolute; | |
| top: 0; | |
| left: 0; | |
| width: 150px; | |
| height: 40px; | |
| line-height: 53px; | |
| } | |
| button.clicked { | |
| background-color: red; | |
| } | |
| button.clicked::after { | |
| content: " (clicked)"; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <button id="background">background</button> | |
| <script> | |
| document.body.addEventListener('click', (e) => { | |
| e.target.classList.add('clicked'); | |
| }); | |
| </script> | |
| </body> | |
| </html> |