srcset testcases for SVG

Relative SVG with explicit dimensions - 1x

expected
actual
This test should show an SVG image of size 100x50, and intrinsic/natural size 100x50.The left half of the image should be pink and there should be a purple circle in the center.

Relative SVG with explicit dimensions - 4x

expected
actual
This test should show an SVG image of size 100x50, and intrinsic/natural size 50x25. The left half of the image should be pink and there should be a purple circle in the center.