<!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <!-- From https://bugzilla.mozilla.org/show_bug.cgi?id=779029 --> <title>Test that the x/y/width/height attributes work on the mask element</title> <mask id="mask" x="20%" y="20%" width="60%" height="60%"> <rect width="1000" height="1000" fill="white"/> </mask> <rect width="100%" height="100%" fill="lime"/> <rect x="50" y="50" width="100" height="100" fill="red" mask="url(#mask)"/> <rect x="70" y="70" width="60" height="60" fill="lime"/> </svg>