When I\'m working with CSS, I\'ll often test in a browser - say, Chrome - right click an element, click Inspect Element, and edit the CSS right there. The use of arrow keys
As mentioned by cloudworks, the answer to this has changed. This can now be accomplished rather well by the Chrome DevTools Autosave extension. This tool tracks CSS and JavaScript changes made within the Chrome Developer Tools console, and saves them back to local files. For instructions to install and setup the extension, please refer to the guide written by @addyosmani on his blog, here.
There is also a handy screencast which details the extension rather well.