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Run results for:
insertAdjacentHTML vs insertBefore
Comparing performance of: insertBefore vs insertAdjacentHTML
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<iframe src="https://measurethat.net/Embed?id=497122" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
insertBefore
323.0 Ops/sec
insertAdjacentHTML
653.8 Ops/sec
HTML Preparation code:
<div id="test"></div>
Script Preparation code:
function randomElement(parent) { const index = Math.floor(Math.random() * parent.children.length); return parent.children[index]; } var count = 1000;
Tests:
insertBefore
var newElement = document.createElement("div"); newElement.append(document.createElement("div")); for (i = 0; i < count; i++) { var newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); newElement.insertBefore(newElementPart, randomElement(newElement)); } document.getElementById("test").append(newElement);
insertAdjacentHTML
var newElement = document.createElement("div"); newElement.append(document.createElement("div")); for (i = 0; i < count; i++) { var newElementPart = document.createElement("div"); newElementPart.classList.add("testClass"); randomElement(newElement).insertAdjacentHTML("beforebegin",newElementPart); } document.getElementById("test").append(newElement);