| <!DOCTYPE html> |
| <html> |
| <body> |
| <script src="../../resources/js-test-pre.js"></script> |
| <script> |
| description("Test the behavior when assigning null to context.globalCompositeOperation"); |
| |
| var canvas = document.createElement("canvas"); |
| canvas.width = 200; |
| canvas.height = 200; |
| var context = canvas.getContext("2d"); |
| // Initial operation should be "source-over". |
| shouldBeEqualToString("context.globalCompositeOperation", "source-over"); |
| |
| // Setting to 'copy' should work as this is a valid operation. |
| shouldNotThrow("context.globalCompositeOperation = 'copy'"); |
| shouldBeEqualToString("context.globalCompositeOperation", "copy"); |
| |
| // Assignment to null should be ignored because "null" is not a valid operation. |
| shouldNotThrow("context.globalCompositeOperation = null"); |
| shouldBeEqualToString("context.globalCompositeOperation", "copy"); |
| |
| // Assignment to "" should be ignored because "" is not a valid operation. |
| shouldNotThrow("context.globalCompositeOperation = ''"); |
| shouldBeEqualToString("context.globalCompositeOperation", "copy"); |
| </script> |
| <script src="../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
