| <!DOCTYPE html> |
| <!-- |
| | Adjoining vertical margins collapse if both belong to vertically-adjacent box |
| | edges, i.e. top and bottom margins of a box that has no in-flow children. |
| | https://www.w3.org/TR/CSS21/box.html#collapsing-margins |
| --> |
| <!-- TODO: Test for a box that does/does not establish a new block formatting |
| context and that has/does not have zero computed 'min-height', zero |
| or 'auto' computed 'height', and no in-flow children. --> |
| <html> |
| <head> |
| <style> |
| .blue { |
| background-color: #2196f3; |
| height: 100px; |
| width: 100px; |
| } |
| .empty { |
| margin-top: 50px; |
| margin-bottom: 100px; |
| } |
| .indigo { |
| background-color: #3f51b5; |
| height: 100px; |
| width: 100px; |
| } |
| </style> |
| </head> |
| <body> |
| <div class="blue"></div> |
| <div class="empty"></div> |
| <div class="indigo"></div> |
| </body> |
| </html> |
