Run results for: querySelector from document or from element

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SM-G986U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Mobile Safari/537.36

Browser: Chrome Mobile 89

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
querySelector from document	1894324.0 Ops/sec
querySelector from element	3066621.0 Ops/sec

HTML Preparation code:

<html>

<body>
    <div>
        <div>
            <div>
                <div class="element">
                    <div class="test"></div>
                </div>
            </div>
        </div>
    </div>
</body>

</html>

Script Preparation code:

window.element = document.querySelector('.element');

Tests:

querySelector from document
const theHtml = document.querySelector('.test');
querySelector from element
const theHtml = element.querySelector('.test');

Run results for: querySelector from document or from element

Figuring out what's faster, using querySelector from document or from an element closer to the wanted element

querySelector from document

querySelector from element