[crestfallen]

I did a big survey of site stylesheets a while back and HSL use in practice is super, super low. I'll see if I can dig up that old spreadsheet.

And that's the reason I love your suggestion. With some browser support reassurances to the user (HSL is safe to use!), a neat tool like this outputting HSL could help the HSL adoption rate. HSL is pretty nice to work with, so I'd love to see more of it.