marker-mid

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

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 <marker> element, and can only be referenced with a <url> value. The value of the CSS property overrides any values of the marker-mid attribute in the SVG.

The direction each marker points is defined as the direction halfway between the direction at the end of the preceding path segment and the direction of the start of the following path segment. This can be thought of as the cross product of the vectors defined by the two path directions.

Note: The marker-mid property will only have an effect for elements that can use SVG markers. See marker-mid for a list.

Syntax

css

marker-mid: none;
marker-mid: url(markers.svg#arrow);

/* Global values */
marker-mid: inherit;
marker-mid: initial;
marker-mid: revert;
marker-mid: revert-layer;
marker-mid: unset;

Values

none: This means no marker will be drawn at each middle vertex of the element's path.
<marker-ref>: A <url> that refers to a marker defined by an SVG <marker> element, to be drawn at each middle vertex of the element's path. If the URL reference is invalid, no marker will be drawn at the path's middle vertices.

Formal definition

Initial value	`none`
Applies to	`<circle>`, `<ellipse>`, `<line>`, `<path>`, `<polygon>`, `<polyline>`, and `<rect>` elements in an `svg`
Inherited	yes
Computed value	as specified, but with `<url>` values made absolute
Animation type	discrete

Formal syntax

marker-mid = 
  none          |
  <marker-ref>  

<marker-ref> = 
  <url>  

<url> = 
  <url()>  |
  <src()>  

<url()> = 
  url( <string> <url-modifier>* )  |
  <url-token>                      

<src()> = 
  src( <string> <url-modifier>* )

Example

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

html

<svg viewBox="0 0 240 120" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <marker
      id="triangle"
      viewBox="0 0 10 10"
      markerWidth="10"
      markerHeight="10"
      refX="1"
      refY="5"
      markerUnits="strokeWidth"
      orient="auto">
      <path d="M 0 0 L 10 5 L 0 10 z" fill="#f00" />
    </marker>
  </defs>
  <polyline
    id="test"
    fill="none"
    stroke="black"
    points="20,100 40,60 70,80 100,20 130,10 150,10 170,20 170,100 120,100" />
</svg>

css

polyline#test {
  marker-mid: url(#triangle);
}

Specifications

Specification
Scalable Vector Graphics (SVG) 2 # VertexMarkerProperties

Browser compatibility

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