Run details:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/75.0.3770.90 Chrome/75.0.3770.90 Safari/537.36
Chromium 75
Ubuntu
Desktop
5 years ago
Test name Executions per second
getElementById 2181.6 Ops/sec
querySelector 126.9 Ops/sec
HTML Preparation code:
AخA
 
1
<div id="div"></div>
Script Preparation code:
 
div.innerHTML = Array(1000).fill(0).map((el, i) => `<div id="id${i}" class="test${i}"></div>`)
Tests:
  • getElementById

     
    Array(1000).fill(0).map((el, i) =>  document.getElementById(`id${i}`).className)
  • querySelector

     
    Array(1000).fill(0).map((el, i) =>  document.querySelector(`#id${i}`).className)