In the Chrome developer panel, this tool…

lets you select elements and go directly to them in the DOM view, and see their CSS attributes.
Safari has the same tool.
Is there a keyboard shortcut to activate that tool (once you have the panel open)?
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To open / switch from inspect element mode and browser window, you can do:
On Mac – ⌘ + Shift + C
On Windows / Linux – Ctrl + Shift + C OR F12
For more useful keyboard shortcuts, refer to the developer tools documentation.