Run results for: Different types of selecting

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.84 Safari/537.36

Browser: Chrome 68

Operating system: Mac OS X 10.11.6

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
getElementById	2220149.0 Ops/sec
querySelector("#id")	1181788.0 Ops/sec
getElementsByClassName("class")[0]	1754217.0 Ops/sec
querySelector(".class")	1804501.0 Ops/sec
getElementById + getElementsByTagName	1873195.0 Ops/sec
querySelectorAll("#id tag")	434035.1 Ops/sec
getElementById + getElementsByClassName[0]	1623262.0 Ops/sec
querySelector("#id .class")	1505526.0 Ops/sec
getElementsByClassName("class")	2273227.0 Ops/sec
querySelectorAll(".class")	628731.2 Ops/sec

HTML Preparation code:

<div>
  <ul id="id1">
    <li class="c1">Element</li>
    <li id="id2" class="c1">Element</li>
    <li class="c1">Element</li>
    <li class="c1">Element</li>
  </ul>
</div>

Tests:

getElementById
document.getElementById("id2")
querySelector("#id")
document.querySelector("#id2")
getElementsByClassName("class")[0]
document.getElementsByClassName("c1")[0]
querySelector(".class")
document.querySelector(".c1")
getElementById + getElementsByTagName
document.getElementById("id1").getElementsByTagName("li")
querySelectorAll("#id tag")
document.querySelectorAll("#id1 li")
getElementById + getElementsByClassName[0]
document.getElementById("id1").getElementsByClassName("c1")[0]
querySelector("#id .class")
document.querySelector("#id1 .c1")
getElementsByClassName("class")
document.getElementsByClassName("c1")
querySelectorAll(".class")
document.querySelectorAll(".c1")

Run results for: Different types of selecting

getElementById

querySelector("#id")

getElementsByClassName("class")[0]

querySelector(".class")

getElementById + getElementsByTagName

querySelectorAll("#id tag")

getElementById + getElementsByClassName[0]

querySelector("#id .class")

getElementsByClassName("class")

querySelectorAll(".class")