UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Steps to reproduce the problem:
1. In DevTools Elements panel, add a new element style, naming it something that contains a space (for example "outline color" instead of "outline-color"
2. Tab to focus the attribute value
3. Type space
4. Tab again

What is the expected behavior?
I would in this case either discard the erroneous input, or allow editing it

What went wrong?
The attribute and value are no longer focusable or editable.

My guess is you have some kind of truthiness check somewhere getting tripped up by the space value

Did this work before? N/A 

Chrome version: 68.0.3440.106  Channel: stable
OS Version: OS X 10.13.6
Flash Version: 

I ran into this when typing / working quickly (typing "1px solid red" as the attribute name instead of the value.
 

Deleted: tab-bug.gif 94.5 KB

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