Run results for: replaceWith vs replaceChild without iframe

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

replaceWith

42K/s

replaceChild

36K/s

View exact numbers

Test name	Executions per second
✓ replaceWith	41,899 Ops/sec
replaceChild	36,077 Ops/sec

HTML Preparation code:

<div id="container"></div>

Script Preparation code:

var elements = [document.createElement('div'), document.createElement('div')];
var fragment = document.createDocumentFragment();
var container = document.getElementById('container');

elements.forEach(element => fragment.appendChild(element));
container.appendChild(fragment);

Tests:

replaceChild
var changeIndex = 1; elements[changeIndex] = document.createElement('div'); container.replaceChild(elements[changeIndex], container.children[changeIndex]);
replaceWith
var changeIndex = 1; elements[changeIndex] = document.createElement('div'); container.children[changeIndex].replaceWith(elements[changeIndex])