Another JS one (might need to be checked/re-phrased by a JS expert, though, like those above):
Given an element assigned to a variable "child", which of the following could be used as part of a script to remove the padding on the child's parent element?
child[i].parentNode.style.padding = "0";
child.parentNode.style.padding = "0";
child[i].parentNode.padding = "0";
child.parentNode.style.padding = none;
Answer: child[i].parentNode.style.padding = "0";
(Comment: You can't use child.parentNode since the child element will be a NodeList, not a single Node—even if there is only one such child element in the document.)