HTMLCanvasElement: width property

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.

Value

A number.

Examples

Given this <canvas> element:

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

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

js
const canvas = document.getElementById("canvas");
console.log(canvas.width); // 300

Specifications

Specification
HTML Standard
# dom-canvas-height

Browser compatibility

BCD tables only load in the browser

See also