SVG - dégradé

[@lucard]

<filter xmlns="http://www.w3.org/2000/svg" id="dropshadow">

                    <feFlood flood-color="red" result="glowcolor"/>

                    <feFlood flood-color="transparent" result="fillcolor"/>

                    <feFlood flood-color="red" result="strokecolor"/>

         

                    <feGaussianBlur stdDeviation="2" in="SourceGraphic" result="glow0"/>

                    <feComposite in="glow0" in2="SourceAlpha" operator="out" result="glow1"/>

                    <feColorMatrix in="glow1" values="0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 1 1 1 0 0" result="glow2"/>

                    <feComposite in="glowcolor" in2="glow2" operator="in" result="glow"/>

         

                    <feComposite in="fillcolor" in2="SourceGraphic" operator="in" result="fill"/>

                    <feColorMatrix in="SourceGraphic" type="luminanceToAlpha" result="strokealpha"/>

                    <feComposite in="strokecolor" in2="strokealpha" operator="in" result="stroke"/>

                    <feMerge>

                        <feMergeNode in="fill"/>

                        <feMergeNode in="glow"/>

                        <feMergeNode in="stroke"/>

                    </feMerge>

                </filter>

<feColorMatrix in="glow1" values="0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 1 1 1 0 0" result="glow2"/>

RTFM