Run results for: new attr vs update attr

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

add new attr

3.1M/s

update attr

2.4M/s

View exact numbers

Test name	Executions per second
✓ add new attr	3,113,367 Ops/sec
update attr	2,351,972 Ops/sec

HTML Preparation code:

<div id="foo" aria-label=""></div>

Tests:

add new attr
const element = document.getElementById("foo"); element.setAttribute('tabindex', '0');
update attr
const element = document.getElementById("foo"); element.setAttribute('aria-label', 'test');