Benchmark: document.querySelector vs document.getElementsByClassName

HTML Preparation code:

<div class="test1">
  <p>Hello</p>
</div>
<div class="test2">
  <p>Hello</p>
</div>
<div class="test3">
  <p>Hello</p>
</div>
<div class="test4">
  <p>Hello</p>
</div>
<div class="test5">
  <p>Hello</p>
</div>
<div class="test6">
  <p>Hello</p>
</div>
<div class="test7">
  <p>Hello</p>
</div>

Tests:

querySelector
document.querySelector(".test3")
getElementsByClassName
document.getElementsByClassName("test3")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
querySelector
getElementsByClassName

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; Android 12; M2101K9G) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 107 on Android

View result in a separate tab

Test name	Executions per second
querySelector	1440425.0 Ops/sec
getElementsByClassName	1647875.0 Ops/sec

document.querySelector vs document.getElementsByClassName (version: 0)

Comparing performance of: querySelector vs getElementsByClassName

Created: one year ago by: Guest

Jump to the latest result

querySelector

getElementsByClassName

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A