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Test which verifies the basic facilities of feComponentTransfer.

This test uses the following elements : a nested <svg> with a viewBox attribute, <linearGradient>, <filter>, <feComponentTransfer>.

The test case shows four rectangles filled with a gradient showing the effects of feComponentTransfer: an identity function acting as a reference, use of the feComponentTransfer table option, use of the feComponentTransfer linear option, and use of the feComponentTransfer gamma option.

The test is somewhat self-explanatory as the strings document the type of feComponentTransfer operation that is being used.