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In CSS Motion Path as it Appears in Nightly Browsers News: Polar coordinates and the
ray()function have some interesting possibilities... though it seems you might still need to add position info as well. Viewable in Firefox Nightly: codepen.io/danwilson/pen/PoYMrG -
This is where
ray()is defined in the CSS Motion Path spec, by the way: drafts.fxtf.org/motion-1/#valdef-offsetpath-ray