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The <solidColor> SVG element lets authors define a single color for use in multiple places in an SVG document.
<solidColor> is an experimental technology, and not yet implemented in browsers. A workaround is to use a linearGradient with only one color stop. This is less elegant, and, unlike solidColor, cannot itself be used in the definition of gradients.
SVG using solidColor
HTML Content
<svg xmlns="https://www.w3.org/2000/svg" viewBox="0 0 300 200" height="150">
<defs>
<!-- solidColor is experimental. -->
<solidColor id="myColor" solid-color="gold" solid-opacity="0.8"/>
<!-- linearGradient with a single color stop is a less elegant way to
achieve the same effect, but it works in current browsers. -->
<linearGradient id="myGradient">
<stop offset="0" stop-color="green" />
</linearGradient>
</defs>
<text x="10" y="20">Circles colored with solidColor</text>
<circle cx="150" cy="65" r="35" stroke-width="2" stroke="url(#myColor)" fill="white"/>
<circle cx="50" cy="65" r="35" fill="url(#myColor)"/>
<text x="10" y="120">Circles colored with linearGradient</text>
<circle cx="150" cy="165" r="35" stroke-width="2" stroke="url(#myGradient)" fill="white"/>
<circle cx="50" cy="165" r="35" fill="url(#myGradient)"/>
</svg>