Run results for: insertAdjacentHTML vs append

Run details:

User agent: Mozilla/5.0 (Linux; Android 6.0.1; SAMSUNG SM-N910C) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/12.0 Chrome/79.0.3945.136 Mobile Safari/537.36

Browser: Chrome Mobile 79

Operating system: Android 6.0.1

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
append	74.2 Ops/sec
insertAdjacentHTML	145.7 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);
insertAdjacentHTML
html = "<div id='testing'>" for (i = 0; i < 1000; i++) { html += "<div class='testClass'></div>"; } html += "</div>"; document.getElementById("test").insertAdjacentHTML("beforeend", html);