Evolving the MediaWiki platform: Why we replaced Tidy with a HTML5 parser

Foundation From the archives MediaWiki Technology

Three years ago, the Wikimedia Foundation's Parsing Team decided to replace Tidy, a tool to fix HTML errors, with a HTML5-based tool. Here's what we did in that time period, and what kind of complexities we faced in changing pieces of the technical infrastructure powering Wikimedia wikis.

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