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Skins can choose to provide these values using Codex tokens by importing
one of the Codex themes in their mediawiki.skin.variables.less. To
guarantee that the variables corresponding to Codex tokens always exist,
provide neutral fallback values for all of them in
mediawiki.skin.defaults.less.
To ensure that mediawiki.skin.defaults.less doesn't get out of sync with
Codex when new tokens are added, add a structure test that verifies that
every Codex token has a corresponding default variable. This isn't an
ideal system, and we'll be able to handle this better once Codex has a
real theme system (T286689) and we can upstream this set of neutral
values into Codex itself.
For now, keep (almost) all existing variables' values the same. This
means overriding some of the values from Codex. We should consider whether
some of these should be changed in a follow-up patch. The only values
changed in this patch are:
- @max-width-breakpoint-tablet from calc(719px) to 719px (no visual
impact; but we should consider changing this to 1119px which is what
it is in Codex)
Bug: T325237
Change-Id: I04f9e48a1cf9dee915cf51e1e12b17ff0a595a06
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