Run results for: append vs appendChild vs insertAdjacentHTML vs DOMParser vs createContextualFragment vs append documentFragment

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0

Browser: Firefox 99

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
append	767.2 Ops/sec
appendChild	748.5 Ops/sec
insertAdjacentHTML	1061.8 Ops/sec
DOMParser	869.9 Ops/sec
createContextualFragment	835.6 Ops/sec
append documentFragment	514.7 Ops/sec

HTML Preparation code:

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

Tests:

append
var newElement = document.createElement("div"); newElement.id = "testing" for (i = 0; i < 1000; i++) { var newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); newElement.append(newElementPart); } document.getElementById("test").append(newElement);
appendChild
var newElement = document.createElement("div"); newElement.id = "testing" for (i = 0; i < 1000; i++) { var newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); newElement.appendChild(newElementPart); } document.getElementById("test").appendChild(newElement);
insertAdjacentHTML
html = "<div id='testing'>" for (i = 0; i < 1000; i++) { html += "<div class='testClass'></div>"; } html += "</div>"; document.getElementById("test").insertAdjacentHTML("beforeend", html);
DOMParser
html = "<div id='testing'>" for (i = 0; i < 1000; i++) { html += "<div class='testClass'></div>"; } html += "</div>"; document.getElementById("test").append((new DOMParser()).parseFromString(html, "text/html").body.firstChild);
createContextualFragment
html = "<div id='testing'>" for (i = 0; i < 1000; i++) { html += "<div class='testClass'></div>"; } html += "</div>"; document.getElementById("test").append(document.createRange().createContextualFragment(html));
append documentFragment
var newElement = document.createElement("div"); newElement.id = "testing" var docFrag = document.createDocumentFragment(); for (i = 0; i < 1000; i++) { var newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); docFrag.append(newElementPart); } newElement.append(docFrag); document.getElementById("test").append(newElement);