The marker CSS property points to a marker that will be drawn on the first, middle, and last vertices of the element's path; that is, at all of its vertices. The marker must have been defined using an SVG element, and can only be referenced with a value. The value of the CSS property overrides any Values of the marker-start, marker, and marker-end attributes in the SVG....referenced with a <url> value. The value of the CSS property overrides...overrides any values of the marker-start , marker , and marker-end...