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|  | (Empty) | 
| 1 <!DOCTYPE HTML> |  | 
| 2 |  | 
| 3 <style> |  | 
| 4 body { -webkit-margin-collapse: separate; } |  | 
| 5 |  | 
| 6 .flowA { -webkit-flow-into: flowA; } |  | 
| 7 .flowB { -webkit-flow-into: flowB; } |  | 
| 8 .flowC { -webkit-flow-into: flowC; } |  | 
| 9 |  | 
| 10 .regionFlowA { -webkit-flow-from: flowA; } |  | 
| 11 .regionFlowB { -webkit-flow-from: flowB; } |  | 
| 12 .regionFlowC { -webkit-flow-from: flowC; } |  | 
| 13 |  | 
| 14 .regionFlowA, .regionFlowB, .regionFlowC { width: 0px; height: 0px; } |  | 
| 15 </style> |  | 
| 16 |  | 
| 17 <div class="flowA"> |  | 
| 18     <!-- The following region should be ignored. Direct circular reference. --> |  | 
| 19     <div class="regionFlowA"></div> |  | 
| 20 </div> |  | 
| 21 |  | 
| 22 <div class="flowB"> |  | 
| 23     <div class="regionFlowC"></div> |  | 
| 24     <!-- The following region should be ignored. Direct circular reference. --> |  | 
| 25     <div class="flowC regionFlowC"></div> |  | 
| 26 </div> |  | 
| 27 |  | 
| 28 <div class="flowC"> |  | 
| 29     <!-- The following region should be invalid. Circular reference through flow
    B which already has created a link to this flow |  | 
| 30          through the "regionFlowC index1" region. --> |  | 
| 31     <div class="regionFlowB"></div> |  | 
| 32     <div class="regionFlowA"></div> |  | 
| 33 </div> |  | 
| 34 |  | 
| 35 <!-- Force the creation of the flows. In the future we might avoid creating flow
    s if there are no reachable regions. --> |  | 
| 36 <div class="regionFlowA"></div> |  | 
| 37 <div class="regionFlowB"></div> |  | 
| 38 <div class="regionFlowC"></div> |  | 
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