Run results for: querySelector vs tag

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

Test name	Executions per second
1	276143.7 Ops/sec
2	337906.5 Ops/sec
3	236494.9 Ops/sec
4	329664.3 Ops/sec
5	330426.1 Ops/sec
6	358358.9 Ops/sec

HTML Preparation code:

<div>
    <main>
        <nav>
            <b>
                <small>
                    <p id="A" class="idx">12345</p>
                </small>
            </b>
        </nav>
    </main>
</div>

Script Preparation code:

var X = 0;

Tests:

1
document.querySelector("div>main>nav>b>small>p").textContent = ++X;
2
document.querySelector(".idx").textContent = ++X;
3
A.textContent = ++X;
4
document.getElementsByTagName("p")[0].textContent = ++X;
5
document.getElementsByClassName("idx")[0].textContent = ++X;
6
document.getElementById("A").textContent = ++X;