Google’s last update to Chrome changed many things, one of them being the “Inspector” functionality.
Before, when editing css in the inspector window, Chrome would autocomplete the property, but not the value. Also, use of the TAB key to selected the auto completed element was not enabled. You had to use the left arrow key.
Now, just like in firebug for FireFox, Chrome autocompletes both property and value, allowing for the TAB key to toggle a correct entry. Speeds up my in browser manipulations quite a bit!