marker-start - SVG: Scalable Vector Graphics 编辑

The marker-start attribute defines the arrowhead or polymarker that will be drawn at the first vertex of the given shape.

For all shape elements, except <polyline> and <path>, the last vertex is the same as the first vertex. In this case, if the value of marker-start and marker-end are both not none, then two markers will be rendered on that final vertex. For <path> elements, for each closed subpath, the last vertex is the same as the first vertex. marker-start is only rendered on the first vertex of the path data.

Note: As a presentation attribute, marker-start can be used as a CSS property.

As a presentation attribute, it can be applied to any element but it has effect only on the following seven elements:  <circle>, <ellipse>, <line>, <path>, <polygon>, <polyline>, and <rect>

html, body, svg {
  height: 100%;
}

<svg viewBox="0 0 120 120" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <marker id="triangle" viewBox="0 0 10 10"
          refX="1" refY="5"
          markerUnits="strokeWidth"
          markerWidth="10" markerHeight="10"
          orient="auto">
      <path d="M 0 0 L 10 5 L 0 10 z" fill="#f00"/>
    </marker>
  </defs>
  <polyline fill="none" stroke="black"
      points="20,100 40,60 70,80 100,20" marker-start="url(#triangle)"/>
</svg>

Usage notes

none

Indicates that no marker symbol shall be drawn at the first vertex.

<marker-ref>

This value is a reference to a <marker> element, which will be drawn at the first vertex. If the reference is not valid, then no marker will be drawn.

Specifications

Browser compatibility

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See also

• <marker>
• marker-end
• marker-mid