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| PASS Test that getContext with un-supported string throws a TypeError. |
| FAIL Test that getContext with supported string returns correct results Can't find variable: OffscreenCanvasRenderingContext2D |
| FAIL Test that getContext twice with different context type returns null the second time The object is in an invalid state. |
| PASS Test that 2dcontext.canvas should return the original OffscreenCanvas |
| PASS Test that webglcontext.canvas should return the original OffscreenCanvas |
| FAIL Test that OffscreenCanvasRenderingContext2D with alpha disabled makes the OffscreenCanvas opaque assert_approx_equals: Green channel of the pixel at (5, 5) expected 127 +/- 2 but got 255 |
| PASS Test that OffscreenCanvasRenderingContext2D with alpha enabled preserves the alpha |
| PASS Test that 'alpha' context creation attribute is true by default |
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