That's the name of a recent podcast on devMode.fm. Some of it is a little disheartening. Stuff you'd expect, like web devs being asked to solve ridiculous questions about algorithms and very specific JavaScript and zero questions at all about other core fundamental web technologies.
I'm blogging it here because CodePen gets brought up a number of times as a tool used in interviewing, sometimes in an unfortunate way where the computer and account it's set up on specifically has tools like autocomplete turned off, to make the challenge harder!
Here was one of the challenges talked about, set up in CodePen for your practicing pleasure:
See the Pen
Ranges of Sequential Numbers Problem (JS) by Paulo Elias (@pauloelias)
on CodePen.