I have no idea if it works well, but the SVG spec has a .getTotalLength() method...

		onion2k on Dec 8, 2015 \| parent \| context \| favorite \| on: Show HN: Lasergist.com – Your custom design in pur... I have no idea if it works well, but the SVG spec has a .getTotalLength() method for path elements, which should mean it's possible to calculate the total length in a browser quite easily. A decent JavaScript developer should be able to prove whether it works well or not in an hour or two.