Exploring the distinction between child nodes and child elements within JavaScript DOM:
For instance,
var myTbodyElement = myTableElement.firstChild;
versus
var mySecondTrElement = myTbodyElement.childNodes[1];
Is it possible to interchangeably use first child and child node?
.firstChild is the equivalent of childNodes[0].
firstChild will give you the first child nodechildNodes will return a collection of all child nodesfirstElementChild will provide the first child elementchildren will yield a collection of all child elementsIs it possible to use first child and child node interchangeably?
Yes, if your only aim is to access the very first one.
Demo:
var d = document.getElementById('myDiv');
var firstChild = d.firstChild;
var childNodes0 = d.childNodes[0];
var firstElementChild = d.firstElementChild;
var children0 = d.children[0];
console.log("d.childNodes.length is", d.childNodes.length);
console.log("firstChild", firstChild.nodeName, firstChild.textContent);
console.log("childNodes[0]", childNodes0.nodeName, childNodes0.textContent);
console.log("d.children.length is", d.children.length);
console.log("firstElementChild", firstElementChild.nodeName, firstElementChild.textContent);
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