The stroke attribute is a presentation attribute defining the color (or any SVG paint servers like gradients or patterns) used to paint the outline of the shape;
Note: As a presentation attribute stroke can be used as a CSS property.
You can use this attribute with the following SVG elements:
<svgviewBox="0 0 20 10"xmlns="http://www.w3.org/2000/svg"><!-- Simple color stroke --><circlecx="5"cy="5"r="4"fill="none"stroke="green"/><!-- Stroke a circle with a gradient --><defs><linearGradientid="myGradient"><stopoffset="0%"stop-color="green"/><stopoffset="100%"stop-color="white"/></linearGradient></defs><circlecx="15"cy="5"r="4"fill="none"stroke="url(#myGradient)"/></svg>