| <!DOCTYPE html> |
| <style> |
| #myCanvas { |
| width: 100%; |
| height: 100%; |
| background-color: rgb(241, 241, 241); |
| } |
| </style> |
| <canvas id="myCanvas"></canvas> |
| <script> |
| if (window.testRunner) { |
| testRunner.waitUntilDone(); |
| } |
| |
| var myCanvas = document.getElementById("myCanvas"); |
| myCanvas.setAttribute("width", 400); |
| myCanvas.setAttribute("height", 400); |
| var offscreenCanvas = myCanvas.transferControlToOffscreen(); |
| var offscreen2d = offscreenCanvas.getContext("2d"); |
| offscreen2d.clearRect(0, 0, 400, 400); |
| offscreen2d.fillStyle = "green"; |
| offscreen2d.fillRect(0, 0, 200, 200); |
| |
| requestAnimationFrame(() => { |
| requestAnimationFrame(() => { |
| if (window.testRunner) { |
| testRunner.notifyDone(); |
| } |
| }); |
| }); |
| |
| </script> |
