Added jQuery to web pages (by adding to each .erb; would prefer to call jquery-1.10.2.min.js in layout.erb but Sinatra can't find it for level-down pages e.g. /element/ pages [finds it fine for top level e.g. /eo page]).
Element page: in electron configs, highlight n values for above and origin element when mouse over "above" element.
Next: figure out rules for what parts of e configs to highlight when mouse over an adjacent (to the origin) element.