| <!DOCTYPE html> |
| <!-- |
| | A stacking context and a containing block may be different boxes, |
| | so the parent stacking context should offset the child stacking context |
| | by the sum of all offsets of containing blocks between it and the child. |
| --> |
| <html> |
| <head> |
| <style> |
| .absolutely-positioned { |
| position: absolute; |
| } |
| .level-1 { |
| background-color: #b3e5fc; |
| padding: 10px; |
| } |
| .level-2 { |
| background-color: #40c4ff; |
| padding: 20px; |
| } |
| .level-3 { |
| background-color: #00b0ff; |
| padding: 40px; |
| } |
| .level-4 { |
| background-color: #0091ea; |
| height: 100px; |
| width: 100px; |
| } |
| .absolutely-positioned.level-4 { |
| background-color: #01579b; |
| } |
| .with-z-index { |
| z-index: -1; |
| } |
| </style> |
| </head> |
| <body> |
| <div class="absolutely-positioned level-1 with-z-index"> |
| <div class="level-2"> |
| <div class="absolutely-positioned level-3"> |
| <div class="level-4"></div> |
| <div class="absolutely-positioned level-4 with-z-index"></div> |
| </div> |
| </div> |
| </div> |
| </body> |
| </html> |
