Bug 1918419 Comment 0 Edit History

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(Change also required for `position-try` shorthand)
WPT tests seem to operate under the assumption of preserving user input; however, as mentioned in bug 1899949 comment 4, and as [per](https://drafts.csswg.org/css-anchor-position-1/#propdef-position-try-order) [spec](https://drafts.csswg.org/css-anchor-position-1/#propdef-position-try-fallbacks), the serializations should be in [canonical ordering](https://www.w3.org/TR/cssom/#serializing-css-values).

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