Run results for: document.getElementById, document.querySelector, element.querySelector

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

element.querySelector

6.9M/s

document.getElementById

6.3M/s

document.querySelector

2.7M/s

View exact numbers

Test name	Executions per second
✓ element.querySelector	6,882,864 Ops/sec
document.getElementById	6,272,103 Ops/sec
document.querySelector	2,674,466 Ops/sec

HTML Preparation code:

<header>Page header</header>
<nav>Navigation</nav>
<section id="content">
  <div id="nothing1"></div>
  <div id="nothing2"></div>
  <div id="nothing3"></div>
  <div id="container">
    <p><input id="testbutton" type="button" value="Test Button"></input></p>
  </div>
</section>
<footer>Page footer</footer>

Script Preparation code:

var container = document.getElementById("container");

Tests:

document.getElementById
document.getElementById("testbutton");
document.querySelector
document.querySelector("#testbutton");
element.querySelector
container.querySelector("#testbutton");