| | When an inline box contains an in-flow block-level box, the inline box |
| | (and its inline ancestors within the same line box) are broken around |
| | the block-level box (and any block-level siblings that are consecutive |
| | or separated only by collapsible whitespace and/or out-of-flow elements), |
| | splitting the inline box into two boxes (even if either side is empty), one |
| | on each side of the block-level box(es). The line boxes before the break |
| | and after the break are enclosed in anonymous block boxes, and |
| | the block-level box becomes a sibling of those anonymous boxes. |
| | https://www.w3.org/TR/CSS21/visuren.html#anonymous-block-level |
| background-color: #40c4ff; |
| background-color: #00b0ff; |
| /* TODO: When such an inline box is affected by relative positioning, any |
| * resulting translation also affects the block-level box contained |
| background-color: #0091ea; |
| <div class="level-3">III</div> |