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
WHATWG HTML Living Standard
The definition of 'CanvasRenderingContext2D.shadowOffsetY' in that specification.
Living Standard  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

See also


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