Run results for: queryselector (from document or from parent) vs getelementbyid

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Linux

Device Platform: Desktop

Date tested: 7 months ago

document.getElementById

46.8M/s

parent.querySelector

18.7M/s

document.querySelector

7.0M/s

View exact numbers

Test name	Executions per second
✓ document.getElementById	46,822,976 Ops/sec
parent.querySelector	18,691,258 Ops/sec
document.querySelector	7,033,170 Ops/sec

HTML Preparation code:

<div id='abc'>
    <div id='abcd'>
        <div id='abcde'>
            <div id='abcdefg'>
                <div id='abcdefghi'>
                </div>
            </div>
        </div>
    </div>
</div>
<div id='abcdef'>
    <div id='abcdefgh'>
    </div>
</div>

Script Preparation code:

const parent = document.getElementById('abcdefg');

Tests:

document.querySelector
document.querySelector('#abcdefghi');
parent.querySelector
parent.querySelector('#abcdefghi');
document.getElementById
document.getElementById('abcdefghi');