Run results for: Direct querySelector scope vs no scope

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

querySelector no scope

4.5M/s

querySelector scope

3.7M/s

View exact numbers

Test name	Executions per second
✓ querySelector no scope	4,453,404 Ops/sec
querySelector scope	3,735,874 Ops/sec

HTML Preparation code:

<div id='parent'>
  <div class="foo">
    <div class="bar">
      <div class="baz">
      </div>
    </div>
  </div>
</div>

Tests:

querySelector scope
document.getElementById("parent").querySelector(':scope > .foo')
querySelector no scope
document.getElementById("parent").querySelector('.foo')