Run results for: alpha false

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

false

102K/s

true

53K/s

View exact numbers

Test name	Executions per second
✓ false	102,473 Ops/sec
true	52,885 Ops/sec

HTML Preparation code:

<div style="width: 830; height: 200; background-color: red;"> <canvas id="canvas1" width="400" height="400"></canvas> <canvas id="canvas2" width="400" height="400"></canvas> </div> <style> canvas { border: 1px solid black; } </style>

Script Preparation code:

var can = document.getElementById('canvas1');
var ctx = can.getContext('2d');
ctx.fillRect(50,50,50,50);
ctx.clearRect(0,0,400,400);

var can2 = document.getElementById('canvas2');
var ctx2 = can2.getContext('2d', {alpha: false} );
ctx2.fillRect(50,50,50,50);
ctx2.clearRect(0,0,400,400);

Tests:

false
ctx2.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx2.fillRect(0,0,400,400);
true
ctx.fillStyle = 'rgba(255, 255, 255, 0.3)'; ctx.fillRect(0,0,400,400);