<marker>

The <marker> element defines the graphic that is to be used for drawing arrowheads or polymarkers on a given <path>, <line>, <polyline> or <polygon> element.

Markers are attached to shapes using the marker-start, marker-mid, and marker-end properties.

html,body,svg { height:100% }

<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <!-- arrowhead marker definition -->
    <marker id="arrow" viewBox="0 0 10 10" refX="5" refY="5"
        markerWidth="6" markerHeight="6"
        orient="auto-start-reverse">
      <path d="M 0 0 L 10 5 L 0 10 z" />
    </marker>

    <!-- simple dot marker definition -->
    <marker id="dot" viewBox="0 0 10 10" refX="5" refY="5"
        markerWidth="5" markerHeight="5">
      <circle cx="5" cy="5" r="5" fill="red" />
    </marker>
  </defs>

  <!-- Coordinate axes with a arrowhead in both direction -->
  <polyline points="10,10 10,90 90,90" fill="none" stroke="black"
   marker-start="url(#arrow)" marker-end="url(#arrow)"  />

  <!-- Data line with polymarkers -->
  <polyline points="15,80 29,50 43,60 57,30 71,40 85,15" fill="none" stroke="grey"
   marker-start="url(#dot)" marker-mid="url(#dot)"  marker-end="url(#dot)" />
</svg>

Attributes

markerHeight

This attribute defines the height of the marker viewport.
Value type: <length> ; Default value: 3; Animatable: yes

markerUnits

This attribute defines the coordinate system for the attributes markerWidth, markerHeight and the contents of the <marker>.
Value type: userSpaceOnUse|strokeWidth ; Default value: strokeWidth; Animatable: yes

markerWidth

This attribute defines the width of the marker viewport.
Value type: <length> ; Default value: 3; Animatable: yes

orient

This attribute defines the orientation of the marker relative to the shape it is attached to.
Value type: auto|auto-start-reverse|<angle> ; Default value: 0; Animatable: yes

preserveAspectRatio

This attribute defines how the svg fragment must be deformed if it is embedded in a container with a different aspect ratio.
Value type: (none| xMinYMin| xMidYMin| xMaxYMin| xMinYMid| xMidYMid| xMaxYMid| xMinYMax| xMidYMax| xMaxYMax) (meet|slice)? ; Default value: xMidYMid meet; Animatable: yes

refX

This attribute defines the x coordinate for the reference point of the marker.
Value type: left|center|right|<coordinate> ; Default value: 0; Animatable: yes

refY

This attribute defines the y coordinate for the reference point of the marker.
Value type: top|center|bottom|<coordinate> ; Default value: 0; Animatable: yes

viewBox

This attribute defines the bound of the SVG viewport for the current SVG fragment.
Value type: <list-of-numbers> ; Default value: none; Animatable: yes

Global attributes

Core Attributes

Most notably: id, tabindex

Styling Attributes

class, style

Conditional Processing Attributes

Most notably: requiredExtensions, systemLanguage

Presentation Attributes

Most notably: clip-path, clip-rule, color, color-interpolation, color-rendering, cursor, display, fill, fill-opacity, fill-rule, filter, mask, opacity, pointer-events, shape-rendering, stroke, stroke-dasharray, stroke-dashoffset, stroke-linecap, stroke-linejoin, stroke-miterlimit, stroke-opacity, stroke-width, transform, vector-effect, visibility

ARIA Attributes

aria-activedescendant, aria-atomic, aria-autocomplete, aria-busy, aria-checked, aria-colcount, aria-colindex, aria-colspan, aria-controls, aria-current, aria-describedby, aria-details, aria-disabled, aria-dropeffect, aria-errormessage, aria-expanded, aria-flowto, aria-grabbed, aria-haspopup, aria-hidden, aria-invalid, aria-keyshortcuts, aria-label, aria-labelledby, aria-level, aria-live, aria-modal, aria-multiline, aria-multiselectable, aria-orientation, aria-owns, aria-placeholder, aria-posinset, aria-pressed, aria-readonly, aria-relevant, aria-required, aria-roledescription, aria-rowcount, aria-rowindex, aria-rowspan, aria-selected, aria-setsize, aria-sort, aria-valuemax, aria-valuemin, aria-valuenow, aria-valuetext, role

Usage notes

Specifications

Browser compatibility

See also

• Related marker properties: marker-start, marker-mid, and marker-end