| <!DOCTYPE html> |
| <!-- |
| | If the element has "position: fixed", the containing block is established |
| | by the padding edge of the nearest ancestor with a transform. |
| | https://www.w3.org/TR/CSS21/visudet.html#containing-block-details |
| | NOTE: While this is not explicitly stated in the spec, which states that |
| | the containing block of a fixed position element must always be the viewport |
| | this is how all major browsers handle them. |
| --> |
| <html> |
| <head> |
| <style> |
| body { |
| margin: 0px; |
| } |
| .fixed-positioned { |
| position: fixed; |
| } |
| .transformed { |
| transform: rotate(0deg); |
| } |
| .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: 120px; |
| width: 120px; |
| } |
| .top { |
| top: 0; |
| width: 60px; |
| height: 60px; |
| } |
| .fixed-positioned.level-4 { |
| background-color: #01579b; |
| } |
| </style> |
| </head> |
| <body> |
| <div class="fixed-positioned transformed level-1"> |
| <div class="fixed-positioned transformed level-2"> |
| <div class="level-3"> |
| <div class="level-4"></div> |
| <div class="fixed-positioned top level-4"></div> |
| </div> |
| </div> |
| </div> |
| </body> |
| </html> |
