From Search Engine Land

Now when users click on your featured snippets from Google Search results, they’ll either be taken directly to the featured snippet text on the source web page and/or highlight the text featured in the snippet on that web page. Google has been testing this for the past couple of years and confirmed yesterday that it rolled out last week. There’s no markup or action to take to enable this, it will happen automatically. As Barry Schwartz notes, you might want to reevaluate the location of calls to action and or ads on pages this affects.