"Best" way to check if an Element is attached?

What is the best way to check if an Element instance is attached? The same like Widget.isAttached().

The options I see: I could 

1) ask the Body Element if  it contains the Element instance (Document.get().getBody().isOrHasChild(element)) 

2) I could walk up the tree from the Element instance till I encounter the Body html element.

I think 2) is faster, but is there another (better) option I am forgetting.

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