The HTMLCanvasElement.width property is a positive integer reflecting the width HTML attribute of the <canvas> element interpreted in CSS pixels. When the attribute is not specified, or if it is set to an invalid value, like a negative, the default value of 300 is used.

This is one of the two properties, the other being HTMLCanvasElement.height, that controls the size of the canvas.

Syntax

var pxl = canvas.width;
canvas.width = pxl;

Examples

Given this <canvas> element:

<canvas id="canvas" width="300" height="300"></canvas>

You can get the width of the canvas with the following code:

var canvas = document.getElementById('canvas');
console.log(canvas.width); // 300

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'HTMLCanvasElement.width' in that specification.
Living Standard No change since the latest snapshot, HTML5
HTML 5.1
The definition of 'HTMLCanvasElement.width' in that specification.
Recommendation  
HTML5
The definition of 'HTMLCanvasElement.width' in that specification.
Recommendation Snapshot of the HTML Living Standard containing the initial definition.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support4123.6993.1
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes4 Yes Yes Yes

See also

Document Tags and Contributors

 Contributors to this page: fscholz, nmve, erikadoyle, Nexii
 Last updated by: fscholz,