[Gecko Bug 1820070] Part 2: Add at <position> into ray() in style system. #40408
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We reuse PositionOrAuto here, and let "auto" represent the situation when the
author omits "at " because it has a special meaning.
https://drafts.fxtf.org/motion-1/#valdef-ray-at-position
Note: No need to update css/motion/parsing/offset-path-parsing-valid.html
because Blink added some to the upstream repo already.
Differential Revision: https://phabricator.services.mozilla.com/D179860
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1820070
gecko-commit: c9a0635b6d98eaac89582e4bfff31d6e330dc4e6
gecko-reviewers: emilio