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:150.0) Gecko/20100101 Firefox/150.0

Browser: Firefox 150

Operating system: Windows

Device Platform: Desktop

Date tested: 4 months ago

Benchmark engine: Benchmark.js

getElementById

13.1M/s

getElementsByTagName

8.8M/s

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

5.5M/s

querySelector by attribute (partial matching)

5.3M/s

View exact numbers

Test name	Executions per second
✓ getElementById	13,103,518 Ops/sec
getElementsByTagName	8,844,799 Ops/sec
querySelector by attribute (partial matching) - variant (starts with)	5,455,041 Ops/sec
querySelector by attribute (partial matching)	5,319,456 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];