Run results for: querySelector check - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0

Browser: Firefox 61

Operating system: Windows 7

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
querySelector id	1400798.0 Ops/sec
getElementById	3476892.0 Ops/sec
getElementsByClassName	3519015.0 Ops/sec
querySelector class	1747397.0 Ops/sec

Website performance monitoring

HTML Preparation code:

<html>
  <body>
    <div id="test2"></div>
    <div id="test"></div>
    <div class="test-123"></div>
  </body>
</html>

Tests:

querySelector id
document.querySelector("#test");
getElementById
document.getElementById("test");
getElementsByClassName
document.getElementsByClassName("test-123");
querySelector class
document.querySelector(".test-123");