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:148.0) Gecko/20100101 Firefox/148.0

Browser: Firefox 148

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 6 months ago

Benchmark engine: Benchmark.js

getElementById

15.7M/s

getElementsByTagName

9.6M/s

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

7.0M/s

querySelector by attribute (partial matching)

7.0M/s

View exact numbers

Test name	Executions per second
✓ getElementById	15,731,398 Ops/sec
getElementsByTagName	9,609,146 Ops/sec
querySelector by attribute (partial matching) - variant (starts with)	7,023,756 Ops/sec
querySelector by attribute (partial matching)	6,975,000 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];