The marker-mid CSS property points to a marker that will be drawn on the middle vertices of the element's path; that is, at each of its vertices between the start and end 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-mid attribute in the SVG....<line> , <path> , <polygon> , <polyline> , and <rect> elements in...fill="#f00" /> </marker> </defs> <polyline id="test" fill="none" stroke="black"...