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<!DOCTYPE html> <html> <body> <h3>A demonstration of how to access a CANVAS element</h3> <canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;"> Your browser does not support the HTML5 canvas tag.</canvas> <p>Click the button to draw on the canvas.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var c = document.getElementById("myCanvas"); var ctx = c.getContext("2d"); ctx.fillStyle = "#FF0000"; ctx.fillRect(20, 20, 150, 100); } </script> </body> </html>