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


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


Using the shadowOffsetY property

This is just a simple code snippet using the shadowOffsetY property to set a shadow with a vertical 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.shadowOffsetY = 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.shadowOffsetY' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes12 Yes Yes Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes Yes Yes Yes Yes

See also


このページの貢献者: fscholz, nmve, erikadoyle, notetienne
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