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Web Inspector in Opera 15/Chrome/Chromium does not support copying directly HTML element CSS paths opposite to Dragonfly in Opera 12 (Document > Layout > Parent offsets). You can use this small patch to add Copy CSS path command to element context menus.

Opera 17.0.1240.0: end of the story

Preparation
1. download and compile PakTool.cs (on Windows use the command in line 1, on Linux or Mac use Mono)
2. download this patch file into the same folder
3. install patch utility if you haven't got one already (on Windows download this, or install MinGW32 and run mingw-get.exe install msys-patch command)

Patching
1. copy opera.pak from your Opera installation (or resources.pak from your Chrome/Chromium installation) next to the already compiled PakTool
2. run these commands (modify file names and patch tool location if necessary)

PakTool decode -in opera.pak -out temp
cd temp
patch < ../copycsspath.patch
cd ..
PakTool encode -in temp -out opera.pak

3. copy the modified .pak file into its original location

You have to patch your Opera/Chrome/Chromium installation after each program update.