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<html><body><h2>SVG mask Element</h2><svg width="200" height="120" xmlns="http://www.w3.org/2000/svg"> <defs> <mask id="mask1"> <circle cx="50" cy="50" r="30" fill="white" /> </mask> </defs> <rect x="0" y="0" width="100" height="100" fill="red" mask="url(#mask1)" /> <rect x="0" y="0" width="100" height="100" stroke="black" fill="none"/> Sorry, your browser does not support inline SVG.</svg> </body></html>