Today it happened. Google changed its search algorithms to penalize websites which aren't configured to be mobile-friendly. After all, there are about 1.9 billion around the world with smartphones, documents eMarketer. Here, Sarah Perez provides all the details in TechCrunch.
Essentially, "mobile-friendly" means:
- Text must be readable without zooming or any taps
- Appropriate spacing of tap targets
- No unplayable content or horizontal scrolling for pages.
What gets the gong if it doesn't conform? According to Google, the search rank will be affected only for the page, not the whole website. And, only on smartphones, not tablets.