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A11Y-LANGDeterministic
The page declares its language
What the source requires
The document carries a lang attribute.
Why this is hard to satisfy
One attribute, almost always absent on templated sites, and without it a screen reader may read English copy with a Spanish voice.
What we do about it
Emitted with the document. A one-line fix that nobody looks for.
In build · phase two
What this tier means
Same input, same verdict, every time — no model in the loop. This is the only tier where the word “verified” is literally true.