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Animation Elements with External References
This slide tests the 'viewport-fill' and 'viewport-fill-opacity' attributes defined locally.
The externally resource referenced by the animation element has a 'viewport-fill' defined with a black to yellow gradient. This should be ignored and the local definitions should be used - red for the left, blue for the middle and semi-transparent black for the right.
A semi-transparent yellow rectangle should be animating within each viewport.