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    Canvas API

    Added in HTML5, the HTML <canvas> element can be used to draw graphics via scripting in JavaScript. For example, it can be used to draw graphs, make photo compositions, create animations, or even do real-time video processing or rendering.

    Mozilla applications gained support for <canvas> starting with Gecko 1.8 (i.e. Firefox 1.5). The element was originally introduced by Apple for the OS X Dashboard and Safari. Internet Explorer supports <canvas> from version 9 onwards; for earlier versions of IE, a page can effectively add support for <canvas> by including a script from Google's Explorer Canvas project. Google Chrome and Opera 9 also support <canvas>.

    The <canvas> element is also used by WebGL to do hardware-accelerated 3D graphics on web pages.


    This is just a simple code snippet which uses the CanvasRenderingContext2D.fillRect() method.


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


    var canvas = document.getElementById("canvas");
    var ctx = canvas.getContext("2d");
    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" />
    <textarea id="code" class="playable-code">
    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);
    reset.addEventListener("click", function() {
      textarea.value = code;
    edit.addEventListener("click", function() {
    textarea.addEventListener("input", drawCanvas);
    window.addEventListener("load", drawCanvas);


    The interfaces related to the WebGLRenderingContext are referenced under WebGL.

    Guides and tutorials

    Canvas tutorial
    A comprehensive tutorial covering both the basic usage of <canvas> and its advanced features.
    Code snippets: Canvas
    Some extension developer-oriented code snippets involving <canvas>.
    Demo: A basic ray-caster
    A demo of ray-tracing animation using canvas.
    Drawing DOM objects into a canvas
    How to draw DOM content, such as HTML elements, into a canvas.
    Manipulating video using canvas
    Combining <video> and <canvas> to manipulate video data in real time.




    • Fabric.js is an open-source canvas library with SVG parsing capabilities.
    • Kinetic.js is an open-source canvas library focused on interactivity for desktop and mobile applications.
    • Paper.js is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas.
    • libCanvas is powerful and lightweight canvas framework.
    • Processing.js is a port of the Processing visualization language.
    • PlayCanvas is an open source game engine.
    • Pixi.js is an open source game engine.
    • PlotKit is a charting and graphing library.
    • Rekapi is an animation key-framing API for Canvas.
    • PhiloGL is a WebGL framework for data visualization, creative coding and game development.
    • JavaScript InfoVis Toolkit creates interactive 2D Canvas data visualizations for the Web.


    Specification Status Comment
    WHATWG HTML Living Standard
    The definition of 'Canvas' in that specification.
    Living Standard  

    See also