Run results for: querySelector by attribute (partial matching) VS getElementById VS getElementsByTagName

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Windows

Device Platform: Desktop

Date tested: 3 months ago

Benchmark engine: Benchmark.js

getElementById

13.4M/s

getElementsByTagName

7.9M/s

querySelector by attribute (partial matching) - variant (starts with)

5.6M/s

querySelector by attribute (partial matching)

5.4M/s

View exact numbers

Test name	Executions per second
✓ getElementById	13,426,344 Ops/sec
getElementsByTagName	7,896,096 Ops/sec
querySelector by attribute (partial matching) - variant (starts with)	5,644,092 Ops/sec
querySelector by attribute (partial matching)	5,419,496 Ops/sec

HTML Preparation code:

<video id="vid" src="blob:https://example.com/file.mp4"></video>

Tests:

querySelector by attribute (partial matching)
var test_one = document.querySelector("video[src*='blob:http']");
querySelector by attribute (partial matching) - variant (starts with)
var test_one_variant = document.querySelector("video[src^='blob:http']");
getElementById
var test_two = document.getElementById("vid");
getElementsByTagName
var test_three = document.getElementsByTagName("video")[0];