| <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"> | |
| <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="300px" height="300px" viewBox="0 0 300 300" version="1.1"> | |
| <defs> | |
| <mask id="mask" maskUnits="userSpaceOnUse" x="0" y="0" width="300" height="300"> | |
| <rect x="50" y="50" width="200" height="200" fill="white"/> | |
| </mask> | |
| </defs> | |
| <rect x="100" y="0" width="100" height="300" fill="black" mask="url(#mask)"/> | |
| </svg> |
