Question

I’m wondering if anybody knows of a Vim plugin that can handle cursor movement between parent/child/sibling elements on either HTML or XML files (preferably both).

Answer 1

I like to use the default movement and (visual) text objects

 vatatzc   # create a fold for second parent tag with all child elements

 yit6jvitp # yank this element child nodes and, 6 lines down, 
           # replace the element content with the yanked text