https://developer.mozilla.org/en-US/docs/Web/API/SVGMarkerElement/markerUnits
SVGMarkerElement: markerUnits property - Web APIs | MDN
The markerUnits read-only property of the SVGMarkerElement interface returns an SVGAnimatedEnumeration object. This object returns an integer which represents...
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https://caniuse.com/mdn-api_svgmarkerelement_refy
SVGMarkerElement API: refY | Can I use... Support tables for HTML5, CSS3, etc
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
can i use