I see that https://developers.google.com/ offers articles in different language. They get the language from browser setting and don't place any language slug in the URL. Is this really a good practise? I read already alot articles, but I am still very unsure what is the best way.
I also read this guide: https://support.google.com/webmasters/answer/182192?hl=en
It's still not clear what is the best way. It would be nice if the way without the slug works good with SEO, but I better ask here before.
If I chose this way, I need to take care about special things? Or is the language definition in the
<html> tag enough? And what is about
hreflang? This will not work if all URLs are the same without any slug.