which approach is more correct to get element in document with focus?

I have went through couple of questions already asked related with this and i have found two common approach. 1. Have global element and update it by attaching onFocus() event to each of the element.
2. document.activeElement and have following code to update the element in case of old browser which do not support the property var focusedElement; document.addEventListener("focus", function(e) { focusedElement = e.target; }, true); document.addEventListener("blur", function(e) { focusedElement = null; }, true); Now my question is which one is more correct/easy/efficient approach of above two? why? Thanks all,

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