| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>CanvasRenderingContext 2D with alpha=flase, clearRect</title> |
| <link rel="author" title="Justin Novosad" href="mailto:junov@chromium.org"> |
| <link rel="help" href="https://html.spec.whatwg.org/#concept-canvas-alpha"> |
| <link rel="match" href="clearRect_alpha_false-ref.html"> |
| <meta name="assert" content="Canvas pixels remain opaque black when drawing semi-transparent rectangle."> |
| <p>Test passes if a 100x100 black square is displayed below.</p> |
| <canvas id="c" width=100 height=100></canvas> |
| <script> |
| const ctx = document.getElementById("c").getContext("2d", {alpha: false}); |
| ctx.fillColor = 'red'; |
| ctx.fillRect(25, 25, 50, 25); |
| ctx.clearRect(24, 24, 52, 52); |
| </script> |