Run results for: FIND SINGLE ELEMENT: querySelector(ID, TagName e Class) vs getElementsByClassName vs getElementsByID vs getElementsByTagName — (getElementsByClassName sem .(ponto)) - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36

Browser: Chrome 75

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
querySelector (Class)	2784270.0 Ops/sec
getElementsByClassName	2446941.2 Ops/sec
querySelector (ID)	1850874.6 Ops/sec
getElementsByID	3730648.2 Ops/sec
getElementsByTagName	2808286.8 Ops/sec
querySelector (TagName)	2723683.8 Ops/sec

HTML Preparation code:

<div class="test" id="test"></div>

Tests:

querySelector (Class)
document.querySelector(".test")
getElementsByClassName
document.getElementsByClassName("test")[0]
querySelector (ID)
document.querySelector("#test")
getElementsByID
document.getElementById("test")
getElementsByTagName
document.getElementsByTagName("div")[0]
querySelector (TagName)
document.querySelector("div")

;