We have seen the Google Explore feature many times, but here is a similar explore feature but as a sub-feature of a single search result snippet. Google is testing showing a scrollable snippet that is more visual and interactive.

This was spotted by Scott Salter who shared a video of it in action on Twitter, here is a static image from the video:

Here is the video:

Here is his tweet:

Bing Search had a feature like this some time ago.

Forum discussion at Twitter.