| <!DOCTYPE html> |
| <html> |
| <body> |
| <canvas id ="canvas"></canvas> |
| <script> |
| var canvas = document.getElementById('canvas'); |
| var ctx = canvas.getContext("2d"); |
| |
| // Adjust the canvas to get highdpi rendering. |
| canvas.style.width = '270px'; |
| canvas.style.height = '275px'; |
| canvas.width = 270 * devicePixelRatio; |
| canvas.height = 275 * devicePixelRatio; |
| ctx.scale(devicePixelRatio, devicePixelRatio); |
| |
| var fillW = 250; |
| var fillH = 50; |
| ctx.beginPath(); |
| ctx.rect(0, 0, fillW, fillH); |
| ctx.closePath(); |
| ctx.clip(); |
| ctx.fillStyle = 'green'; |
| ctx.fillRect(0, 0, fillW, fillH); |
| </script> |
| </body> |
| </html> |
