Whether this new feature supports mobile view?
Topic on 2017 wikitext editor/Feedback
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Right now the beta feature is desktop-only. Technologically it works fine in our testing, but we're not releasing it there yet. Once we've received some feedback and we're confident that it's working well overall, we'll work on replacing the mobile Web wikitext editor to make the experience consistent between mobile and desktop. This will probably be around March, when we would hope to make it available there as a "beta channel" feature on mobile.
Ohh..