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You give a proof with a specific page used only by admins. But there's no double encoding of ampersands in Mediawiki. Everywhere else the "<" have to be escaped to avoid incorrect matches as candidate tags. valid numeric entities and at leastr the few basic standard characters (which are not "named entities" in HTML, but part of its required syntax) are implicitly recognized (they do not require any DTD, their supprot is mandatory in all HTML and XMS parsers, and in MediaWiki itself): "lt", "gt" for tags, and quotation marks and required for attributes and ampersands for URLs; the support is extended to numeric entities since HTML4 and in all versions of XML and mandatory in HTML5. It is mandatory since ever in all versions of MediaWiki (initially however it had limited support for Unicode and allowed numeric entities mapped to 8-bit only codepoints before UTF-8 became mandatory, which occured when HTML was fixed to require Unicode-only mapping of numeric entities, forbidding mappings to legacy codepages, even if the pages themselves would still be encoded with legacy charsets, this no longer applied to numeric entities). You're living in the early non-standard age of HTML of the end of the 1980's when MediaWiki did not exist, Translatewiki.net did not exist and HTML was full of ioncompatible proprietary versions derived inconsistantly from the initial CERN invention.

Verdy p (talk)18:54, 30 October 2019

Verdy_p, in my diff comment, I had given you a proof YOU can check because you ARE a translation admin on meta wiki!

Pols12 (talk)10:16, 31 October 2019

No, your sample page does not work for translation admins. It is only for sysadmins.

Verdy p (talk)20:43, 1 November 2019

The general guideline is to use what the source uses and not worry about escaping things (in fact, if you would need to worry about escaping, that would be a security issue). I see no reason to deviate from this guideline here.

Nike (talk)10:29, 1 November 2019