| <!doctype html> |
| <!-- |
| Copyright 2016 The Chromium Authors. All rights reserved. |
| Use of this source code is governed by a BSD-style license that can be |
| found in the LICENSE file. |
| --> |
| <html style="height:100%"> |
| <head> |
| <style> |
| html, body { |
| margin: 0; |
| padding: 0; |
| } |
| </style> |
| </head> |
| <body style="height:100%"> |
| <canvas id="canvas" width="200" height="100"></canvas> |
| </body> |
| <script> |
| var canvas = document.querySelector('canvas'); |
| canvas.style.width ='100%'; |
| canvas.style.height='100%'; |
| canvas.width = canvas.offsetWidth; |
| canvas.height = canvas.offsetHeight; |
| var ctx = canvas.getContext("2d"); |
| var rColor = 0; |
| |
| function animate() { |
| rColor += 1; |
| rColor %= 255; |
| ctx.fillStyle = 'rgb(' + rColor + ',0,0)'; |
| ctx.fillRect(0, 0, canvas.width, canvas.height); |
| window.requestAnimationFrame(animate); |
| } |
| window.onload = animate; |
| </script> |
| </html> |
