Translations:Help:TemplateStyles/16/en

Yes! TemplateStyles includes a full-fledged CSS parser that reads, re-serializes and escapes all code and removes CSS rules which do not match its whitelist. The parser is sufficiently fine-grained to reject remote resources (such as background images) but allow local ones. CSS selectors are rewritten so that they cannot refer to elements outside article content. (Visually modifying areas outside article content by displacing parts of the article, e.g. via absolute positioning, is not prevented at this time. This is no change from the status quo, as such a thing was already possible with wikitext and inline styles.)