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Why didn't they decide to keep the strictness, but only in dev mode? Lets say after you checked some checkbox in browser settings or if you had dev tools opened

• gsnedders 10y ago
  "keep the strictness" from what, though? Presto-Opera reported parse errors in the dev tools, for example (parse errors have a clear, unambiguous definition even in the current HTML spec). DTD validation? As far as I'm aware, it would only be keeping it at a spec level—no implementation aside from validators ever implemented it. There's nothing stopping a browser from noting any validation error, though (and note they wouldn't just happen at parse time—they could happen following any DOM modification).