parent.childNodes.forEach(function (node) {

  let n = node;

});

for (let i = 0; i < parent.children.length; i++) {

  let n = parent.children[i];

}

let children = parent.children;

​

for (let i = 0; i < children.length; i++) {

  let n = children[i];

}

for (let i = parent.children.length-1; i >= 0; i--) {

  let n = parent.children[i];

}

let children = parent.children;

​

for (let i = children.length-1; i >= 0; i--) {

  let n = children[i];

}

for (let i = 0; i < parent.childNodes.length; i++) {

  let n = parent.childNodes[i];

}

let children = parent.childNodes;

​

for (let i = 0; i < children.length; i++) {

  let n = children[i];

}

for (let i = parent.childNodes.length-1; i >= 0; i--) {

  let n = parent.childNodes[i];

}

let children = parent.childNodes;

​

for (let i = children.length-1; i >= 0; i--) {

  let n = children[i];

}

let elem = parent.firstElementChild;

do {

  let n = elem;

} while (elem = elem.nextElementSibling)

let elem = parent.lastElementChild;

do {

  let n = elem;

} while (elem = elem.previousElementSibling)

let elem = parent.firstChild;

do {

  let n = elem;

} while (elem = elem.nextSibling)

let elem = parent.lastChild;

do {

  let n = elem;

} while (elem = elem.previousSibling)