Google's John Mueller confirmed on Twitter that having space separated attributes in the nofollow attribute will still work as a nofollow.

Google's John Mueller confirmed that they completely ignore the HTML lang attribute for determining the language and region of the page. John said this at the 55:54 mark into the video hangout ...

11 HTML Attributes For SEO & Why They Matter HTML is the foundation of a webpage. Discover the key HTML tags and attributes that are crucial to good SEO. Find out their uses and how to code them.