No problem, I'm quitting the messy MediaWiki stack for a clean XML one :-)
On Thu, 18 Dec 2025 at 03:40, Halley Coplin <[email protected]> wrote:
> Hello, technical contributors!
>
> The MediaWiki Interfaces team is deprecating XSLT stylesheets within the
> Action API.
>
> Support for the format=xml&*xlst={stylesheet}* will be removed from
> Wikimedia projects by the end of November, 2025. In addition, it will soon
> be disabled by default in MediaWiki release versions: v1.43 (LTS), v1.44,
> and v1.45. Support for XSLT stylesheets will be fully removed from
> MediaWiki v1.46 (expected to release between April and May 2026).
>
>
> *=== Why are we deprecating and removing this capability? ===*
> Support for XSLT is generally being removed from browsers, due to a high
> rate of security risks and declining usage. Chrome is officially starting
> the XSLT deprecation cycle
> <https://developer.chrome.com/docs/web-platform/deprecating-xslt>in
> November 2025, with full removal expected by November 2026. Other browsers
> are expected to follow. To ensure that we are not including a feature that
> will no longer be supported by browsers, we decided to end support, as
> well.
>
>
> *=== What is the impact? === *
> There is currently very limited adoption of this feature across Wikimedia
> projects, with usage limited to a handful of gadgets that currently rely on
> this capability. We are engaging with some of the key gadget owners
> directly, so they are aware of the change and can adjust or remove lesser
> used features accordingly.
>
> We also recognize that some third parties may rely on XSLT stylesheets. In
> this case, we encourage consumers to find alternative solutions as soon as
> possible, given the end of XSLT support goes beyond the scope of MediaWiki.
>
>
>
> I encourage tool developers, gadget authors, and third party users to
> engage directly if you have questions, concerns, or if this change may
> block your ability to upgrade to future versions in a timely manner.
>
>
> Thanks,
> Halley
>
> *Halley Coplin* (she/her)
> Sr. Product Manager, MediaWiki Interfaces
> Wikimedia Foundation <https://wikimediafoundation.org/>
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