1. A method for displaying a document, the document having a set of sibling content elements, the set including a first element that is associated with a non-overlapping positioning scheme and a second element that is associated with an overlapping positioning scheme, comprising: displaying, in a first two-dimensional layer, the first element; and displaying, in a second two-dimensional layer, the second element; wherein the first layer and the second layer are displayed separate from each other in three-dimensional space.