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>

<svg viewBox="0 0 120 120" xmlns="">
    <marker id="triangle" viewBox="0 0 10 10"
          refX="1" refY="5" 
          markerWidth="10" markerHeight="10"
      <path d="M 0 0 L 10 5 L 0 10 z" fill="#f00"/>
  <polyline fill="none" stroke="black" 
      points="20,100 40,60 70,80 100,20" marker-start="url(#triangle)"/>

Usage notes

Value none | <marker-ref>
Default value none
Animatable discrete
Indicates that no marker symbol shall be drawn at the first vertex.
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.


Specification Status Comment
Scalable Vector Graphics (SVG) 2
The definition of 'marker-start' in that specification.
Candidate Recommendation No significant change
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of 'marker-start' in that specification.
Recommendation Initial definition

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
marker-startChrome ? Edge ? Firefox ? IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android ?


Compatibility unknown  
Compatibility unknown

See also