| <!DOCTYPE html> |
| <!-- |
| | Stacking contexts are different from containing blocks. This test ensures |
| | that elements with an 'auto' z-index still use the correct stacking context |
| | when their containing block is further up the tree than their stacking |
| | context. The results should show the blue box in front of the gray box. |
| | https://www.w3.org/TR/CSS21/visuren.html#z-index |
| --> |
| <html> |
| <head> |
| <style> |
| .blue-container { |
| position: absolute; |
| |
| left: 20px; |
| top: 20px; |
| |
| width: 150px; |
| height: 150px; |
| z-index: 3; |
| |
| background-color: rgb(100, 100, 100); |
| } |
| .blue { |
| position: fixed; |
| |
| left: -20px; |
| top: -20px; |
| |
| width: 100px; |
| height: 100px; |
| |
| background-color: rgb(100, 100, 255); |
| } |
| </style> |
| </head> |
| <body> |
| <div class="blue-container"> |
| <div class="blue"></div> |
| </div> |
| </body> |
| </html> |
