===== POC RESULT =====
[LEAK CONFIRMED] SMIL fill exposes :visited state via getComputedStyle()
  visited   <a>.color (mitigated baseline) = rgb(11, 22, 33)
  unvisited <a>.color (mitigated baseline) = rgb(11, 22, 33)
  visited   <rect>.fill (SMIL animated)    = rgb(244, 233, 222)
  unvisited <rect>.fill (SMIL animated)    = rgb(11, 22, 33)
  -> fill differs by :visited state: true
======================

(Chrome console, --enable-logging=stderr)
[453:453:INFO:CONSOLE:36] "[LEAK CONFIRMED] SMIL fill exposes :visited state via getComputedStyle()
  visited   <a>.color (mitigated baseline) = rgb(11, 22, 33)
  unvisited <a>.color (mitigated baseline) = rgb(11, 22, 33)
  visited   <rect>.fill (SMIL animated)    = rgb(244, 233, 222)
  unvisited <rect>.fill (SMIL animated)    = rgb(11, 22, 33)
  -> fill differs by :visited state: true", source: http://127.0.0.1:8000/test.html (36)