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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:141.0) Gecko/20100101 Firefox/141.0

Browser: Firefox 141

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

getElementById

5.9M/s

getElementsByTagName

4.0M/s

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

2.9M/s

querySelector by attribute (partial matching)

2.9M/s

View exact numbers

Test name	Executions per second
✓ getElementById	5,925,912 Ops/sec
getElementsByTagName	3,953,934 Ops/sec
querySelector by attribute (partial matching) - variant (starts with)	2,895,002 Ops/sec
querySelector by attribute (partial matching)	2,877,894 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];