SVG Presentation Attributes - SVG: Scalable Vector Graphics
-background fill fill-opacity fill-rule filter flood-color flood-opacity font-family font-size font-size-adjust font-stretch font-style font-variant font-weight glyph-orientation-horizontal glyph-orientation-vertical image-rendering kerning letter-spacing lighting-color marker-end marker-mid marker-start mask opacity overflow pointer-events shape-rendering solid-color solid-opacity stop-color stop-opacity stroke stroke-dasharray stroke-dashoffset stroke-linecap stroke-linejoin stroke-miterlimit stroke-opacity stroke-width text-anchor text-decoration text-rendering transform unicode-bidi vector-effect visibility word-spacing writing-mode attributes alignment-baseline it specifies how an object is aligned along the font baseline with respect to its p...
... value: auto|optimizespeed|crispedges|geometricprecision |inherit; animatable: yes solid-color - value:; animatable: - solid-opacity - value:; animatable: - stop-color indicates what color to use at that gradient stop.

<solidcolor> - SVG: Scalable Vector Graphics
--> <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.