[RussianCow]

It's often much faster to make the change in the code directly than in the dev tools. For instance, I can very quickly apply a LESS mixin to an element, which would require knowing and making those specific changes to the raw CSS via the browser. The same goes for pretty much anything that's more than a one-value change.

[dota_fanatic]

Yes, I agree for what you’re describing, but that’s not the scenario I was referring to: the one where you don’t know how far over, how tall, how opaque, etc something should be and there’s no existing pattern to reach for off-the-shelf, like a mixin. Iterative exploration of design space.