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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:147.0) Gecko/20100101 Firefox/147.0

Browser: Firefox 147

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 9 months ago

Benchmark engine: Benchmark.js

getElementById

7.4M/s

getElementsByTagName

4.8M/s

querySelector by attribute (partial matching)

3.3M/s

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

3.2M/s

View exact numbers

Test name	Executions per second
✓ getElementById	7,354,866 Ops/sec
getElementsByTagName	4,760,302 Ops/sec
querySelector by attribute (partial matching)	3,256,311 Ops/sec
querySelector by attribute (partial matching) - variant (starts with)	3,210,504 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];