Run results for: querySelector vs getElementById

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 months ago

getElementById

16.2M/s

querySelector

10.1M/s

View exact numbers

Test name	Executions per second
✓ getElementById	16,216,496 Ops/sec
querySelector	10,084,856 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->
<sspa id="sspa">
  <span>hello world</span>
</sspa

Script Preparation code:

/*your preparation JavaScript code goes here
To execute async code during the script preparation, wrap it as function globalMeasureThatScriptPrepareFunction, example:*/
async function globalMeasureThatScriptPrepareFunction() {
    // This function is optional, feel free to remove it.
    // await someThing();
}

Tests:

querySelector
document.querySelector("sspa")
getElementById
document.getElementById("sspa")