| <html> |
| <body> |
| <canvas id="c" width=800 height=1000></canvas> |
| <script> |
| |
| // Test that canvas content is retained from previous frame for partial updates. |
| var canvas = document.getElementById('c'); |
| let ctx = canvas.getContext("2d"); |
| |
| // Since it checks if content retaining |mode_| changes from frame to frame, |
| // multiple calls to rAF are used to assure the craetion of new frame. |
| ctx.fillRect(0, 0, 50, 50); |
| window.requestAnimationFrame(dt => { |
| ctx.clearRect(0, 0, 40, 50); |
| ctx.fillRect(60, 60, 50, 50); |
| window.requestAnimationFrame(dt => { |
| ctx.clearRect(60, 60, 50, 40); |
| ctx.fillRect(200, 200, 20, 10); |
| }); |
| }); |
| |
| </script> |
| </body> |
| </html> |
