Run results for: className vs. setAttribute vs. classList on body

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

HTML Preparation code:

<body></body>

Tests:

className
var i = 1000; while (i--) { document.body.className = "bar"; }
setAttribute
var i = 1000; while (i--) { document.body.setAttribute("class", "bar"); }
classList
var i = 1000; while (i--) { document.body.classList.add("bar"); }