How do I tell if an element is a HTMLElement

We often use nodeType==1 to determine whether the element is a HMTLElement. The elements on the page are all nodes, including Element Node, Attribute Node, Text Node, etc. W3c nodeType is defined as follows

Const unsigned short ELEMENT_NODE = 1;
Const unsigned short ATTRIBUTE_NODE = 2;
Const unsigned short TEXT_NODE = 3;
Const unsigned short CDATA_SECTION_NODE = 4;
Const unsigned short ENTITY_REFERENCE_NODE = 5;
Const unsigned short ENTITY_NODE = 6;
Const unsigned short PROCESSING_INSTRUCTION_NODE = 7;
Const unsigned short COMMENT_NODE = 8;
Const unsigned short DOCUMENT_NODE = 9;
Const unsigned short DOCUMENT_TYPE_NODE = 10;
Const unsigned short DOCUMENT_FRAGMENT_NODE = 11;
Const unsigned short NOTATION_NODE = 12;

But what if our custom object also contains a nodeType attribute? Such as

var obj = {nodeType:1}; 
function isHTMLElement(obj){ 
    if(obj.nodeType){ 
        return obj.nodeType==1; 
    } 
} 
isHTMLElement(obj);//true 

The isHTMLElement(obj) above returns true, but obj is clearly not an HTML node element. Let's look at the object properties and the try-catch statement.

function isHTMLElement(obj){ 
    var d = document.createElement("div"); 
    try{ 
        d.appendChild(obj.cloneNode(true)); 
        return obj.nodeType==1?true:false; 
    }catch(e){ 
        return false; 
    } 
} 
var obj1 = {nodeType:1}; 
var obj2 = document.createTextNode("hello"); 
var obj2 = document.createElement("p"); 
isHTMLElement(obj1);//false 
isHTMLElement(obj2);//false 
isHTMLElement(obj3);//true 

I'm going to do something special with Windows and documents

function isHtmlControl(obj) {  

    var d = document.createElement("div"); 
    try{ 
        d.appendChild(obj.cloneNode(true)); 
        return obj.nodeType==1 ? true : false; 
    }catch(e){ 
        return obj==window || obj==document; 
    } 
}