Of course! First of all, if you run Atom in design mode (with an argument -don the command line), you will actually have the “Inspect Element” element in your context menu, which will do exactly what you are describing. However, even outside of development mode, simply open the developer console using cmd-option-i(or View → Developer → Toggle Developer Tools in the menu) and click on the “Elements” tab to view the full DOM:

You may also find Styleguide useful as it documents CSS inline classes and interface elements. Launch it from the command palette using Styleguide: Show.

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