The markerWidth read-only property of the SVGMarkerElement interface returns an SVGAnimatedLength object containing the width of the <marker> viewport as defined by the markerWidth attribute.
The markerWidth read-only property of the SVGMarkerElement interface returns an SVGAnimatedLength object containing the width of the <marker> viewport as defined by the markerWidth attribute.
An SVGAnimatedLength object. The baseVal property of this object returns an SVGLength, the value of which returns the width.
The markerWidth property returns an SVGAnimatedLength which contains an SVGLength with the value of the markerWidth attribute.
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" markerWidth="6" markerHeight="6" orient="auto-start-reverse"> <path d="M 0 0 L 10 5 L 0 10 z" /> </marker> </defs> </svg>
js
let marker = document.getElementById("arrow"); console.log(marker.markerWidth.baseVal.value); // 6
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
markerWidth | 
1 | 12 | 1.5 | 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/markerWidth