| <!DOCTYPE html> | |
| <svg> | |
| <mask id="m"> | |
| <g visibility="hidden"> | |
| <rect width="100" height="100" fill="white" visibility="visible"/> | |
| <rect width="200" height="100" fill="white"/> | |
| </g> | |
| </mask> | |
| <rect width="200" height="100" fill="green" mask="url(#m)"/> | |
| </svg> |