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

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support 4Edge Full support 12Firefox Full support 3.6IE Full support 9Opera Full support 9Safari Full support 3.1WebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes

Legend

Full support  
Full support

See also

Document Tags and Contributors

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