Run results for: Cherrypick replace child vs appending a document fragment

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

replaceChildren method

814K/s

Cherrypick append child

766K/s

Using documentFragment, append new & reuse old children

401K/s

View exact numbers

Test name	Executions per second
✓ replaceChildren method	813,957 Ops/sec
Cherrypick append child	765,693 Ops/sec
Using documentFragment, append new & reuse old children	400,501 Ops/sec

HTML Preparation code:

<div id='test-element'></div>

Script Preparation code:

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

Tests:

Cherrypick append child
var changeIndex = 1; elements[changeIndex] = document.createElement('div'); container.replaceChild(elements[changeIndex], container.children[changeIndex]);
Using documentFragment, append new & reuse old children
var changeIndex = 1; var newChildren = document.createDocumentFragment(); elements[changeIndex] = document.createElement('div'); elements.forEach(element => newChildren.appendChild(element)); while(container.firstChild) { container.firstChild.remove(); } container.appendChild(newChildren)
replaceChildren method
var changeIndex = 1; elements[changeIndex] = document.createElement('div'); container.replaceChildren(elements)