| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>The green box should not disappear</title> | |
| <style> | |
| .box { | |
| width: 400px; | |
| background-color: green; | |
| height: 0px; | |
| opacity: 1; | |
| } | |
| .content { | |
| height: 200px; | |
| width: 200px; | |
| background-color: green; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="box"> | |
| <div class="content"></div> | |
| </div> | |
| </body> | |
| </html> |