How should text following <textPath> be positioned? #104

Where should after be positioned in the following scenario:
<text>before<textPath xlink:href="#path">on path</textPath>after</text>
(I've created an example showing this at http://jsbin.com/gugoje)

Currently, WebKit, Blink, and Edge position after above before in the y-axis, and after on path in the x-axis. Gecko appars to just reset the position of after to 0,0.

One approach is to position after as if on path was a tspan.