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
Per the spec update, the new syntax is: `ray() = ray( <angle> && <ray-size>? && contain? )` And for `<ray-size>`: "If no <ray-size> is specified it defaults to closest-side." So `<ray-size>` is optional and we omit it if it's default value, for serialization. By the way, offset=* properties are supported only in Gecko, so we don't need a servo function to check the preference. Differential Revision: https://phabricator.services.mozilla.com/D171625