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This essay describes the MediaWiki parser handling of the resource known as the "post-expand include size" of the text passed from templates and other transcluded content.
The post-expand include size is the sum of the lengths of the expanded wikitexts generated by transcluded pages (e.g., templates and modules), parser functions, and variables. For years, the limit of the post-expand size has been 2,097,152 bytes (221 bytes), or 2,048 KiB as determined by $wgMaxArticleSize. Pages which exceed this limit are automatically categorized into Category:Pages where post-expand include size is exceeded.