Google has started testing its mobile-first index. This new index will look first at the mobile version of your website for its ranking signals and fall back on the desktop version when there is no mobile version.
Google has been slowly moving toward a mobile-first index for quite a while now. Google first hinted at their intentions of a mobile-first index about a year ago, but November 4 was the first time Google has posted details about the mobile-first index on their own blog.
