Run results for: Benchmark - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Test123	33.3 Ops/sec
Test4455	2176.0 Ops/sec

HTML Preparation code:

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

AخA
 
<div id="foo" class="test"></div>

Tests:

var element = document.getElementById("foo");
element.className = "foo";
var i = 1000;
while (i--) {
	element.className += " bar";
}

 
var element = document.getElementById("foo");element.className = "foo";var i = 1000;while (i--) {    element.className += " bar";}

var element = document.getElementById("foo");
element.className = "foo";
var i = 1000;
while (i--) {
	element.classList.add("bar");
}

 
var element = document.getElementById("foo");element.className = "foo";var i = 1000;while (i--) {    element.classList.add("bar");}