The test case constructs a filter that uses feTile to tile the entire specified filter region. The tile consists of a green rectangle over a larger transparent rectangle. The green rectangle is created with feFlood and feOffset. There is also a semi-transparent blue rectangle that should exactly cover one of the tiled rectangles, creating a purple tile with a black stroke (4 tiles down and 3 across).
The test uses the 'rect' element, feTile, feFlood, feOffset, feMerge, fill style, stroke, font-family and font-size properties.
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The rendered picture should match the reference image, except for possible variations in the labelling text (per CSS2 rules).