代码编辑器:
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<svg width="100%" height="100%" version="1.1"
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xmlns="http://www.w3.org/2000/svg">
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<defs>
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<linearGradient id="red_black" x1="0%" y1="0%" x2="0%" y2="100%">
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<stop offset="0%" style="stop-color:rgb(255,0,0);stop-opacity:1"/>
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<stop offset="100%" style="stop-color:rgb(255,255,0);stop-opacity:1"/>
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</linearGradient>
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</defs>
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<ellipse cx="200" cy="190" rx="85" ry="55"
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style="fill:url(#red_black)"/>
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</svg>