Microsoft is testing expanding the text of the Microsoft Advertising search ads on Bing Search. So when you hover your mouse over an ad in Bing Search, the text expands.
Google was recently testing expanding snippet text on hover and now Bing is. Also, Bing was testing larger search ads when compared to organic listings.
Here is a GIF of this in action from Sachin Patel who shared this on X:
I am not sure if I like this or not.
Forum discussion at X:.