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HTML
<svg height="400px" width="400px">
<filter id="dropshadow" height="130%">
<feGaussianBlur in="SourceAlpha" stdDeviation="1" />
<feOffset dx="2" dy="2" />
<feComponentTransfer>
<feFuncA type="linear" slope="0.5" />
</feComponentTransfer>
<feMerge>
<feMergeNode />
<feMergeNode in="SourceGraphic" />
</feMerge>
</filter>
<circle r="100" cx="120" cy="120" style="filter:url(#dropshadow); fill: red" />
</svg>