The setLineDash() method of the Canvas 2D API's CanvasRenderingContext2D interface sets the line dash pattern used when stroking lines. It uses an array of values that specify alternating lengths of lines and gaps which describe the pattern.

Note: To return to using solid lines, set the line dash list to an empty array.




An Array of numbers that specify distances to alternately draw a line and a gap (in coordinate space units). If the number of elements in the array is odd, the elements of the array get copied and concatenated. For example, [5, 15, 25] will become [5, 15, 25, 5, 15, 25]. If the array is empty, the line dash list is cleared and line strokes return to being solid.

Return value



This is just a simple code snippet which uses the setLineDash() method to draw a dashed line above a solid line.


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


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

ctx.setLineDash([5, 15]);
ctx.moveTo(0, 50);
ctx.lineTo(400, 50);

ctx.moveTo(0, 150);
ctx.lineTo(400, 150);

Try it

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


Specification Status Comment
HTML Living Standard
The definition of 'CanvasRenderingContext2D.setLineDash' 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 27IE Full support 11Opera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android No support NoOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes


Full support  
Full support
No support  
No support

Gecko-specific notes

  • Starting with Gecko 7.0 (Firefox 7.0 / Thunderbird 7.0 / SeaMonkey 2.4), the non-standard and deprecated property mozDash has been implemented to set and get a dash list. This property will be deprecated and removed in the future, see bug 931389. Use setLineDash() instead.

WebKit-specific notes

  • In WebKit-based browsers (e.g., Safari), the non-standard and deprecated property webkitLineDash is implemented besides this method. Use setLineDash() instead.

See also

Document Tags and Contributors

Contributors to this page: mfluehr, fscholz, LeeTaylor, Sheppy, nmve, erikadoyle
Last updated by: mfluehr,