Fictional example: one path, viewBox="0 0 120 100". Fixed fill compared with
fill="currentColor".
fill="#303036". Correct on light.
Same fixed fill. Ignores CSS color and nearly disappears.
Fill follows parent color: #303036.
Same markup. Fill follows parent color: #FAF6ED.
Separate SVG document. Parent CSS color does not inherit, so currentColor
falls back to black.