<!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <svg xmlns="http://www.w3.org/2000/svg"> <title>Test 'mask' containing masked content</title> <mask id="m1" maskUnits="objectBoundingBox" maskContentUnits="objectBoundingBox"> <rect width="0.5" height="1" fill="white"/> </mask> <mask id="m2" maskUnits="objectBoundingBox" maskContentUnits="objectBoundingBox"> <rect width="1" height="1" fill="white" mask="url(#m1)"/> </mask> <rect width="100%" height="100%" fill="lime"/> <rect width="50" height="100%" fill="red"/> <g mask="url(#m2)"> <rect width="50" height="100%" fill="lime"/> <rect x="50" width="50" height="100%" fill="red"/> </g> </svg>