Google is testing revealing expandable video previews in the search engine result. When you hover your mouse over a video thumbnail in the Google search engine result, the video will expand and play a silent preview.This was identified by Brodie Clark who published this screen capture of it Twitter: The test does not amaze me – Google has been making videos slowly and slowly more engaging in Google Search for years.Brodie said “A test where YouTube video material is more interesting in Googles search engine result. Hovering over a video starts the preview on desktop (typical), with the video then becoming bigger + including the description (test).”Forum discussion at Twitter.