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Re:Ask HN: Webdevs, designers: what devtools should we (Mozi... by nc on Tuesday March 05, 2013 @03:00PM (#5326945)
It's not always possible to push changes back to LESS or SASS due to ambiguity at which level changes should be applied - if you're editing CSS values. The browser would have to display SASS or LESS in the inspector for what you're suggesting to work.
Re:Ask HN: Webdevs, designers: what devtools should we (Mozi... by apavlov on Wednesday March 06, 2013 @05:30AM (#5330468)
Chrome Canary (perhaps, the Dev channel, too) supports navigation to CSS selectors, property names and values (Ctrl-click them) in the corresponding Sass resources (the Sources panel). You can edit Sass and save it to disk (right-click the editor, "Save as...").

Now, if you have the "Support for Sass" experiment enabled, you'll see the "Auto-reload CSS upon Sass save" timeout setting to reload re-generated CSS files after "sass --watch in:out --sourcemap" (or equivalent) has updated them on the local disk.