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The CanvasRenderingContext2D.strokeRect() method of the Canvas 2D API draws a rectangle that is stroked (outlined) according to the current strokeStyle and other context settings.

This method draws directly to the canvas without modifying the current path, so any subsequent fill() or stroke() calls will have no effect on it.


void ctx.strokeRect(x, y, width, height);

The strokeRect() method draws a stroked rectangle whose starting point is at (x, y) and whose size is specified by width and height.


The x-axis coordinate of the rectangle's starting point.
The y-axis coordinate of the rectangle's starting point.
The rectangle's width. Positive values are to the right, and negative to the left.
The rectangle's height. Positive values are down, and negative are up.


A simple stroked rectangle

This example draws a rectangle with a green outline using the strokeRect() method.


<canvas id="canvas"></canvas>


The rectangle's top-left corner is at (20, 10). It has a width of 160 and a height of 100.

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.strokeStyle = 'green';
ctx.strokeRect(20, 10, 160, 100);


Applying various context settings

This example draws a rectangle with a drop shadow and thick, beveled outlines.


<canvas id="canvas"></canvas>


const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.shadowColor = '#d53';
ctx.shadowBlur = 20;
ctx.lineJoin = 'bevel';
ctx.lineWidth = 15;
ctx.strokeStyle = '#38f';
ctx.strokeRect(30, 30, 160, 90);



Specification Status Comment
HTML Living Standard
The definition of 'CanvasRenderingContext2D.strokeRect' in that specification.
Living Standard  

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
strokeRectChrome Full support YesEdge Full support 12Firefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView 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


Full support  
Full support

See also

Tag del documento e collaboratori

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