Run results for: createElement vs insertAdjacentHTML but actually works

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.1.1; ZTE BLADE A0620) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.82 Mobile Safari/537.36

Browser: Chrome Mobile 90

Operating system: Android 7.1.1

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
createElement	50.4 Ops/sec
insertAdjacentHTML	67.5 Ops/sec

HTML Preparation code:

<div id="test"></div>

Tests:

createElement
newElement = document.createElement("div"); newElement.id = "testing" for (i = 0; i < 1000; i++) { let 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);