Help:Lint errors/fostered-transparent
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Similar to Help:Lint_errors/fostered, this category records lints of content that is in a fosterable position, that is, located in a table but not in table cells, table headings, and captions.
How it differs is that all the content of the lint is rendering transparent, which means that it has no visible output. Examples are include directives <include>, categories [[Category:123]], etc. These constructs are often placed in fosterable position by design and are stripped by MediaWiki's legacy parser. However, Parsoid leaves around markers in the HTML output for them, which end up being fostered.
While it would create a lot of undesirable noise to lint these with the rest of the fostered content, editing clients like DiscussionTools would still benefit from the knowledge of their presence.
Therefore, this separate hidden category was created.