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Tests that contain the draft-watermark are under development and may be incorrectly testing a feature.
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The rendered picture should match the reference image exactly, except for possible variations in the labelling text (per CSS2 rules).
Test which verifies the basic facilities of feConvolveMatrix.
This test defines six filters that exercise traditional convolutions: uniform blur, vertical and horizontal blurs, edge detection, embossing and sharpening. Note that the edge detection filter produces a fully transparent image because the alpha channel is convolved and produces 0 values.