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SVGMarkerElement: viewBox property

The viewBox read-only property of the SVGMarkerElement interface returns an SVGAnimatedRect object which contains the values set by the viewBox attribute on the <marker>.

Value

An SVGAnimatedRect object. The baseVal property of this object returns an SVGRect object, from which can be returned the x and y co-ordinates, plus the width and height of the <marker> viewBox attribute.

Examples

This example demonstrates how to return the value of the width set for the viewBox 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"
      viewBox="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.viewBox.baseVal.width); //10

Specifications

Specification
Scalable Vector Graphics (SVG) 2 # __svg__SVGFitToViewBox__viewBox

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`viewBox`	1	12	2	9	≤12.1	3	3	18	4	≤12.1	1	1.0

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https://developer.mozilla.org/en-US/docs/Web/API/SVGMarkerElement/viewBox