Run results for: 1 css var - style.setProperty vs style.cssText vs style vs Object.assign vs setAttribute

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 118

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

HTML Preparation code:

<div id="test"><div style="height: calc(var(--w, 1) * 1px); background-color:red;"></div></div>

Script Preparation code:

el = document.getElementById("test");
rn = ()=>Math.floor(10+Math.random(5));

Tests:

style.setProperty
let i = 0; while (i < 10000) { el.style.setProperty("--w", rn); i++; }
style.cssText
let i = 0; while (i < 10000) { el.style.cssText = `--w: ${rn()};`; i++; }
style
let i = 0; while (i < 10000) { el.style = `--w: ${rn()};`; i++; }
Object.assign
let i = 0; while (i < 10000) { Object.assign(el.style, { ['--w']: rn(), }); i++; }
setAttribute
let i = 0; while (i < 10000) { el.setAttribute('style',`--w: ${rn()};`); i++; }