RFE: "Floating labels" (animated labels integrated within form widgets)
I'm filing this as a wishlist/RFE in part because I'd see opportunities to use it in various desktop (and mobile-friendly) apps, but also because that's where the industry of toolkits has been headed. Flutter does this, and so does Bootstrap now. Check out the Floating labels feature documentation & demo page in Bootstrap 5 to interactively see what I'm talking about.
The widget itself is a bit thicker vertically, but you overall you save space and visual complexity over the traditional "label in some table cell, then widget in another cell" approach.
This is different than placeholder text (and it should be possible to use both in tandem, I think).
Edited by Jeff Fortin