I am trying to write Chrome DevTools extension, but I am having some troubles to debug it.
How can I inspect my panel html and debug it's javascript?
If you detach the Dev Tools (icon next to x in the top right corner) in a separate window, and press Ctrl+Shift+I while Dev Tools window is focused, you will invoke the Dev Tools for the Dev Tools window.
As far as I am aware, it's not possible for a docked configuration.
To me it works with detaching the DevTools and hit CTRL+SHIFT+i (Windows).
来源：https://stackoverflow.com/questions/27661243/how-to-debug-chrome-devtools-panel-extension