As mentioned in bug 1430558, when autocompleting CSS functions the parentheses should also be added and pressing the Right Arrow key should place the text cursor between the brackets. This allows for a faster workflow when entering or editing them. Example: 1. Add 'height' as property name 2. Switch to the value input field 3. Type 'c' => The value should be autocompleted to 'calc()' (including the parentheses). 4. Press Right => The text cursor should be placed between the parentheses. FWIW, this is how it worked in Firebug. Sebastian