srcset testcases for SVG

PNG without explicit dimensions - 1x

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actual
This test should show a PNG image of size 200x100, and intrinsic/natural size 200x100. The left half of the image should be red and there should be a black circle in the center.

PNG with explicit dimensions - 1x

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actual
This test should show a PNG image of size 100x50, and intrinsic/natural size 100x50. The left half of the image should be red and there should be a black circle in the center.

PNG without explicit dimensions - 2x

expected
actual
This test should show a PNG image of size 100x50, and intrinsic/natural size 100x50. The left half of the image should be red and there should be a black circle in the center.

PNG with explicit dimensions - 4x

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actual
This test should show a PNG image of size 100x50, and intrinsic/natural size 50x25. The left half of the image should be red and there should be a black circle in the center.