It would be helpful if there were a central list of which CSS properties are supported in TemplateStyles, perhaps hosted on Mediawiki.org and linked to from Help:TemplateStyles.
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It looks like we still have to decide which properties are supported before we document them. :)
T162379: Decide which non-standard CSS properties to support in TemplateStyles
I'd be happy to put a list on-wiki if a list exists.
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I made a quite mention to Ctrl-F'ing the source for $props in https://www.mediawiki.org/wiki/Help:TemplateStyles#What_CSS_rules_are_recognized?, so folks can at least know how to find a list.