Peter Theroux5,600 Points
'up', 'down', and 'add item' buttons do not work. Commenting out the if statements on line 48 allows 'up' to work and likewise with line with 'down', but not at the same time. The console gives an error at line 78. Link to worksheet: https://w.trhou.se/86y59l9ml9
Steven Parker170,996 Points
You just have a couple of typo/spelling errors:
- on line 46 there is "previousElementsSibling" (with an extra "s") instead of "previousElementSibling"
- on line 54 there is "nextElementsSibling" (also with an extra "s") instead of "nextElementSibling"