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The CanvasRenderingContext2D.shadowOffsetX property of the Canvas 2D API specifies the distance that the shadow will be offset in horizontal distance.


ctx.shadowOffsetX = offset;
A float specifying the distance that the shadow will be offset in horizontal distance. The default value is 0. Infinity or NaN values are ignored.


Using the shadowOffsetX property

This is just a simple code snippet using the shadowOffsetX property to set a shadow with a horizontal offset. Note that shadows are only drawn, if the shadowColor property is set to a non-transparent value, too.


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


var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

ctx.shadowColor = 'black';
ctx.shadowOffsetX = 10;
ctx.shadowBlur = 10;

ctx.fillStyle = 'green';
ctx.fillRect(10, 10, 100, 100);

Edit the code below and see your changes update live in the canvas:


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

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome Full support YesEdge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes


Full support  
Full support

See also


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最終更新者: fscholz,