intertwingly

Here's the code.  Key new features vs the original:

• element[:] returns all children of all elements in the list.
• element[f] will apply function f to all elements in the list, and act either as a filter or as a map or even sequence concatenation, depending on the return type.
• all DOM attributes and methods may now be used.
• / and // operators may now be used as "evil" alternatives to indexing.  This was just one of many valuable suggestions from Gary Burd that were incorporated into this version.