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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:124.0) Gecko/20100101 Firefox/124.0

Browser: Firefox 124

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
var(unitless) + calc() + %	402.0 Ops/sec
var(%) + calc()	394.5 Ops/sec
Percentage	584.8 Ops/sec
var(unitless) + calc() + px	361.3 Ops/sec
px	577.7 Ops/sec
var(px) + calc()	385.3 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(%) + calc()
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) + calc()
for (var i = 0; i < nodes.length; i++) { nodes[i].style = "transform: translateY(calc(var(--translationPx)))" }

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

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

var(unitless) + calc() + %

var(%) + calc()

Percentage

var(unitless) + calc() + px

px

var(px) + calc()