Test using "fill-opacity" values for "rect" element. This test verifies that opacity is clamped to the specified range.
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The six rect elements on the left have varying 'fill-opacity' values within the valid range of 0 to 1. The six elements on the right have 'fill-opacity' values outside the 0 to 1 range, and must be clamped. The top three rect elements on the right must have their 'fill-opacity' clamped to 0, while the bottom three rect elements on the right must be clamped to 1.