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:89.0) Gecko/20100101 Firefox/89.0

Browser: Firefox 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
querySelector by attribute (partial matching)	639482.1 Ops/sec
querySelector by attribute (partial matching) - variant (starts with)	624083.9 Ops/sec
getElementById	1420468.5 Ops/sec
getElementsByTagName	908835.1 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];