This does not make sense, I'm not sure what you're trying to say. The cross-sign works on all major browsers. Domain validation as practised by Let's Encrypt is

This does not make sense, I'm not sure what you're trying to say. The cross-sign works on all major browsers. Domain validation as practised by Let's Encrypt is in accordance with CA/B Baseline Requirements, and they're not the first CA to offer domain ownership verification via HTTP.