The CanvasRenderingContext2D.shadowOffsetY property of the Canvas 2D API specifies the distance that the shadow will be offset in vertical distance.
Syntax
ctx.shadowOffsetY = offset;
offset- A float specifying the distance that the shadow will be offset in vertical distance. The default value is 0.
InfinityorNaNvalues are ignored.
Examples
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.
HTML
<canvas id="canvas"></canvas>
JavaScript
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:
Playable code
<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas> <div class="playable-buttons"> <input id="edit" type="button" value="Edit" /> <input id="reset" type="button" value="Reset" /> </div> <textarea id="code" class="playable-code"> ctx.shadowColor = 'black'; ctx.shadowOffsetY = 10; ctx.shadowBlur = 10; ctx.fillStyle = 'green'; ctx.fillRect(10, 10, 100, 100);</textarea>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var textarea = document.getElementById('code');
var reset = document.getElementById('reset');
var edit = document.getElementById('edit');
var code = textarea.value;
function drawCanvas() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
eval(textarea.value);
}
reset.addEventListener('click', function() {
textarea.value = code;
drawCanvas();
});
edit.addEventListener('click', function() {
textarea.focus();
})
textarea.addEventListener('input', drawCanvas);
window.addEventListener('load', drawCanvas);
Specifications
| Specification | Status | Comment |
|---|---|---|
| WHATWG HTML Living Standard The definition of 'CanvasRenderingContext2D.shadowOffsetY' in that specification. |
Living Standard |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |