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代码编辑器：

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" 
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg">

<defs>
<filter id="MyFilter" filterUnits="userSpaceOnUse" x="0" y="0" width="200" height="120">

<feGaussianBlur in="SourceAlpha" stdDeviation="4" result="blur"/>
	
	<feOffset in="blur" dx="4" dy="4" result="offsetBlur"/>

<feSpecularLighting in="blur" surfaceScale="5" specularConstant=".75" specularExponent="20"
	lighting-color="#bbbbbb" result="specOut">
		<fePointLight x="-5000" y="-10000" z="20000"/>
	</feSpecularLighting>

<feComposite in="specOut" in2="SourceAlpha" operator="in" result="specOut"/>

<feComposite in="SourceGraphic" in2="specOut" operator="arithmetic" k1="0" k2="1" k3="1" k4="0" result="litPaint"/>

</filter>
</defs>

<rect x="1" y="1" width="198" height="118" fill="#cccccc" />

<g filter="url(#MyFilter)">
<path fill="none" stroke="#D90000" stroke-width="10" d="M50,90 C0,90 0,30 50,30 L150,30 C200,30 200,90 150,90 z" />
<text fill="#FFFFFF" stroke="black" font-size="45" font-family="Verdana" x="52" y="76">SVG</text>
</g>

</svg>

运行结果：