"Mobile friendliness" will affect how prominently websites appear in Google search results pages from 21 April 2015.
A page is eligible for the “mobile-friendly” label if it meets the following criteria as detected by Googlebot:
- Avoids software that is not common on mobile devices, like Flash
- Uses text that is readable without zooming
- Sizes content to the screen so users don't have to scroll horizontally or zoom
- Places links far enough apart so that the correct one can be easily tapped
