The Chrome team is looking at time and user limited web experiments: https://infrequently.org/2015/08/doing-science-on-the-web/ (a great idea, vendor prefixes rarely die)
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Emacs command of the day: facemenu-set-face, bound to `M-o o'. This lets you set faces on plain text, great for experiments and prototypes.
I suspect this partly due to Emacs supporting wacky experiments, and partly because parens really benefit from good tooling.
Wow, pypy now has a reverse debugger! https://morepypy.blogspot.co.uk/2016/07/reverse-debugging-for-python.html (also a nice demo of how RPython facilitates experiments)