This is driving me nuts. I've just downloaded BBedit, which comes with 'text completion'. I've checked that it is turned on in Preferences.
I'm writing a CSS file. I start to type in 'text-transformation' and as expected it suggests 'text-transformation'. So it completes the property. But then if I start to type the value 'uppercase', it just says 'no completions available'.
Another example, if I start to write 'vertical-align' it will complete the property, but then not suggest the values that this property can have. So I start to write 'top', it suggests 'top' I double click on the suggestion and it adds "top: <##>' to 'vertical-align:'. It is treating 'top' as a property.
So basically BBedit can suggest and automatically complete properties, but not suggest (relevant) values or complete values?