Run results for: compare querySelector nested vs getElementById

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Browser: Chrome 68

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
get to nested 2 by getElementById	1328520.4 Ops/sec
get to nested 2 by query selector	1861739.9 Ops/sec

HTML Preparation code:

<div id="id-up">
  <div id="nested">
    <div id="nested-2" class="nestme"></div>
  </div>
 </div>

Tests:

get to nested 2 by getElementById
var el1 = document.getElementById("id-up"); var el2 = document.getElementById("nested-2"); var className = el2.className;
get to nested 2 by query selector
var el1 = document.getElementById("id-up"); var el2 = el1.querySelector("#nested-2"); var className = el2.className;