[jQuery] Traversing up the DOM

[jQuery] Traversing up the DOM

I see that the basic module has a "find" method that traverses down the DOM
until it finds the specified element.
1. Is there a method that traverses *up* the DOM? If I have a TD node, I would
like to traverse UP the DOM (using parentNode) until I find the Nth specified
TABLE node.
2. What happens if the "find" method is unable to find any matches? What does
it return and how does it affect the rest of the methods chained to it?
Thanks
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