How to check if object is a DOM element? [duplicate]

Answer 1

Instead of just checking for the existence of a property, I'd check its specific value.

This assumes you're looking for a "type 1" element.

nodeType at MDC(docs)

function Check(o) {
    alert( o && o.nodeType && o.nodeType === 1 );
}

You could still get an object that has the nodeType property that isn't actually a DOM node, but it would also have to have a matching value of 1 to give a false positive.