Google Chrome Developer Tools - disable black emulation options ruler

In version 44+:

In the main Dev tool window, click on the kebob menu and then Toggle device Toolbar.

You can hide it by toggling the "Device Mode" button. I'm on Chrome 38 on OSX if that matters.

Note that the rulers will still show up if you need to do Device emulation.

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This is from the Chrome Developer docs: https://developer.chrome.com/devtools/docs/device-mode

Windows: Ctrl + Shift + M

Mac: Cmd + Shift + M

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