Hi, All

As of Firefox 72, I intend to turn the preference of motion-path,
layout.css.motion-path.enabled, on by default on all platforms. Blink has
shipped it already but Webkit doesn't support it yet. There are some
properties defined in the spec, and I would like to ship part of them, to
match the behaviors in Blink:

1. offset-path: none | path()

2. offset-distance

3. offset-rotate

4. offset-anchor

Note: We have implemented ray() for offset-path
<https://www.w3.org/TR/motion-1/#valdef-offsetpath-ray>, but there are
still some critical spec issues not resolved, so I will add a new
preference to disable it on beta and release channels.


*Bug to turn on by default*:
https://bugzilla.mozilla.org/show_bug.cgi?id=1582554

*Spec*: https://www.w3.org/TR/motion-1/ (or
https://drafts.fxtf.org/motion-1/)

*DevTools*: We don't support DevTools for this motion-path now.

*WPT*:
https://searchfox.org/mozilla-central/source/testing/web-platform/tests/css/motion

Thanks
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