<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<svg width="500" height="500">
<!-- ViewBox="0,0 100,100"> -->
<!-- <path D=" M0,0 L100,0 L100,100 L0,100 L0,0" stroke="green" fill="none"/>
<path D="M0,10 L100,10 M0,20 L100,20 M0,30 L100,30 M0,40 L100,40 M0,50 L100,50 M0,60 L100,60 M0,70 L100,70 M0,80 L100,80 M0,90 L100,90" stroke="green" stroke-width="0.2"/>
<path D="M10,0 L10,100 M20,0 L20,100 M30,0 L30,100 M40,0 L40,100 M50,0 L50,100 M60,0 L60,100 M70,0 L70,100 M80,0 L80,100 M90,0 L90,100" stroke="green" stroke-width="0.2"/> -->
<!-- <path D="M20,20 H50 V10 L70,30 L50,50 V40 H20 V20 " stroke="blue"fill="black"/>
<path D="M20,70 l20,-20 v10 h30 v20 h-30 v10 z" stroke="red" fill="black"/> -->
<!-- <rect x="10" y="10" rx="10" width="50" height="50" fill="none" stroke-width="0.2" stroke="red"/>
<path D="M20,20 h30 v30 h-30 z" stroke="black" fill="black"/>
<circle cx="20" cy="20" r="2" fill="blue"/>
<circle cx="50" cy="20" r="2" fill="blue"/>
<circle cx="50" cy="50" r="2" fill="blue"/>
<circle cx="20" cy="50" r="2" fill="blue"/> -->
<!-- <path D="m30,40 Q50,10 70,40"/> -->
<!-- <path D="M50,10 L50,90 M10,50 L90,50 "stroke="black"/> -->
<!-- <path D="M30,50 Q40,30 50,50 Q60,70 70,50 "/> -->
<!-- <path D="M35,50 Q40,30 50,50 60,30 70,50 M30,50 Q50,90 70,50" fill="red"/>
<path D="M30,50 Q40,30 50,50 60,30 70,50 " fill="red"/> -->
<!-- <defs>
<g id="tx">
<rect width="50" height="50"/>
<circle cx="50" cy="50" r="20"/>
</g>
</defs>
<use xlink:href="#tx" x="30" y="30"/> -->
<!-- <defs>
<g id="hei">
<circle r="4" fill="balck"/>
</g>
<g id="hong">
<circle r="4" fill="red"/>
</g>
</defs>
<use xlink:href="#hei" x="50" y="50"/>
<use xlink:href="#hong" x="50" y="60"/>
<use xlink:href="#hong" x="50" y="70"/> -->
<!-- <defs>
<filter id="f1" x="0" y="0">
<feGaussianBlur stdDeviation="10"/>
</filter>
</defs>
<rect width="30" height="30" stroke="green" stroke-width="3" fill="black" filter="url(#f1)"/> -->
<defs>
<linearGradient id="ty1" x1="0%" y1="0%" x2="0%" y2="100%" >
<stop offset="0%" style="stop-color:orange;stop-opacity:0.9"/>
<stop offset="100%" style="stop-color:blue;stop-opacity:0.7"/>
</linearGradient>
</defs>
<ellipse cx="200" cy="50" rx="90" ry="50" fill="url(#ty1)" />
</svg>
</body>
</html>