8. The computer-readable storage media as recited in claim 7 , wherein the layout manager instructions further position or reposition, the displayable equation elements relative to each other without constraint of a grid layout.
7. The computer-readable storage media as recited in claim 1 , further comprising layout manager instructions to assign positions for displayable equation elements relative to each other, the layout manager instructions repositioning elements of a displayed subset of the displayable equation elements to new positions according to edits by user input in an editing browser interface, the layout manager instructions defining the new positions in terms of relative positioning between the displayable equation elements.