HTMLCanvasElement.width

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
WHATWG HTML Living Standard The definition of 'HTMLCanvasElement.width' in that specification.	Living Standard	No change since the latest snapshot, HTML5
HTML5.1 The definition of 'HTMLCanvasElement.width' in that specification.	Recommendation
HTML5 The definition of 'HTMLCanvasElement.width' in that specification.	Recommendation	Snapshot of the WHATWG HTML Living Standard containing the initial definition.

Browser compatibility

See also

• The interface defining it, HTMLCanvasElement.
• The other property controlling the size of the canvas, HTMLCanvasElement.height.