Canvas is used to draw shapes and animations.
    
    ## Why canvas exists
    - charts
    - games
    - drawings
    
    ## Example
    ```html
    <canvas id="box" width="200" height="100"></canvas>
    
    <script>
      const c = document.getElementById("box");
      const ctx = c.getContext("2d");
      ctx.fillStyle = "blue";
      ctx.fillRect(10,10,150,50);
    </script>
    ```
    
    ## UI Preview
    A blue rectangle appears.
    
    ## Note
    Canvas needs JavaScript to work.

Draw graphics using canvas with JavaScript.

HTML Canvas

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HTML Canvas

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