SVGMarkerElement: preserveAspectRatio property

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 preserveAspectRatio read-only property of the SVGMarkerElement interface returns an SVGAnimatedPreserveAspectRatio object containing the value of the preserveAspectRatio attribute of the <marker>.

Value

An SVGAnimatedPreserveAspectRatio object. The baseVal property of this object returns an SVGPreserveAspectRatio object, with the following properties:

align

One of the following numeric constants:

0: SVG_PRESERVEASPECTRATIO_UNKNOWN
1: SVG_PRESERVEASPECTRATIO_NONE
2: SVG_PRESERVEASPECTRATIO_XMINYMIN
3: SVG_PRESERVEASPECTRATIO_XMIDYMIN
4: SVG_PRESERVEASPECTRATIO_XMAXYMIN
5: SVG_PRESERVEASPECTRATIO_XMINYMID
6: SVG_PRESERVEASPECTRATIO_XMIDYMID
7: SVG_PRESERVEASPECTRATIO_XMAXYMID
8: SVG_PRESERVEASPECTRATIO_XMINYMAX
9: SVG_PRESERVEASPECTRATIO_XMIDYMAX
10: SVG_PRESERVEASPECTRATIO_XMAXYMAX

meetOrSlice

One of the following numeric constants:

0: SVG_MEETORSLICE_UNKNOWN
1: SVG_MEETORSLICE_MEET
2: SVG_MEETORSLICE_SLICE

Examples

This example demonstrates how to return the numeric constants for align and meetOrSlice which relate to the values set for the preserveAspectRatio attribute of <marker>.

html

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

let marker = document.getElementById("arrow");
console.log(marker.preserveAspectRatio.baseVal.align); // 6
console.log(marker.preserveAspectRatio.baseVal.meetOrSlice); // 1

Specifications

Specification
Scalable Vector Graphics (SVG) 2 # __svg__SVGFitToViewBox__preserveAspectRatio

Browser compatibility

BCD tables only load in the browser