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> With this attribute being set, the validator treats SSR’d AMP as valid AMP. SSR’d AMP optimizations break the rules of the AMP spec, hence making the document invalid, which is why it’s necessary to indicate this case with this new flag. With the flag and the optimizations both being in place, the document is considered valid and you’re good to go.

Wait, does this mean that websites could serve plain HTML but set this flag and this avoid being penalized by Google? Win!

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