Run results for: CSS calc() + var() test

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Percentage

3K/s

var(px)

2K/s

var(%)

2K/s

var(unitless) + calc() + %

2K/s

var(px) + calc()

2K/s

var(unitless) + calc() + px

2K/s

var(%) + calc()

226/s

View exact numbers

Test name	Executions per second
✓ Percentage	2,708 Ops/sec
px	2,597 Ops/sec
var(px)	1,974 Ops/sec
var(%)	1,969 Ops/sec
var(unitless) + calc() + %	1,692 Ops/sec
var(px) + calc()	1,678 Ops/sec
var(unitless) + calc() + px	1,602 Ops/sec
var(%) + calc()	226 Ops/sec

HTML Preparation code:

<section id="section"></section>

Script Preparation code:

const section = document.getElementById("section");

section.style.setProperty('--translation', '100');
section.style.setProperty('--translationPx', '100px');
section.style.setProperty('--translationPercentage', '100%');


for (var i = 0; i < 1000; i++) {
    const newDiv = document.createElement("div");
    const text = document.createTextNode(`${i}`);
    newDiv.appendChild(text);
    section.appendChild(newDiv);
}

var nodes = document.querySelectorAll("div");

Tests:

var(unitless) + calc() + %
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(calc(var(--translation) * 1%))" }
var(%)
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(var(--translationPercent))" }
Percentage
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(100%)" }
var(unitless) + calc() + px
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(calc(var(--translation) * 1px))" }
px
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(100px)" }
var(px)
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(var(--translationPx))" }
var(px) + calc()
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(calc(var(--translationPx) * 1))" }
var(%) + calc()
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(calc(var(--translationPercent) * 1))" }

Run results for: CSS calc() + var() test

Test difference in performance with calc() and var() functions compared with simple units. Test on unitless, percentage and absolute values.

var(unitless) + calc() + %

var(%)

Percentage

var(unitless) + calc() + px

px

var(px)

var(px) + calc()

var(%) + calc()