Now that MediaWiki has a pure-PHP tidying implementation, we are deprecating non-tidy output.[1] Further, the future rewrite of Parsoid in PHP[2] and its merge to core will have "tidying" as an integral feature.

Thus, the disabletidy parameter to action=parse is being deprecated and will be removed at some point in the future. Clients should stop using the parameter and begin using tidied HTML output.

This change should be deployed to Wikimedia wikis with 1.32.0-wmf.24 or later, see https://www.mediawiki.org/wiki/MediaWiki_1.32/Roadmap for a schedule.