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Template:Exist/doc: Difference between revisions
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(add drawbacks recently discovered by lucario and myself) |
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*<code><nowiki>{{anchorencode:{{lc:{{help:qq w_x}}}}}}</nowiki></code> gives {{anchorencode:{{lc:{{help:qq w_x}}}}}} | *<code><nowiki>{{anchorencode:{{lc:{{help:qq w_x}}}}}}</nowiki></code> gives {{anchorencode:{{lc:{{help:qq w_x}}}}}} | ||
Thus a false-positive for a non-existing page is avoided. A false-negative for an existing page is possible, but typically only for specially constructed examples. | Thus a false-positive for a non-existing page is avoided. A false-negative for an existing page is possible, but typically only for specially constructed examples. | ||
==Drawbacks== | |||
*Because this template works off of transclusion, it invisibly includes the entire wikitext of any page being checked. This makes it an expensive template, possibly slower than #ifexist. | |||
*Also because of transclusion, in certain situations this template can trigger MediaWiki's [[:Category:Pages with template loops|recursive loop warnings]]. This is harmless to page output, however it clutters the category with false positives, which can make it difficult to find legitimate warnings. | |||
==See also== | ==See also== |