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"This property specifies a length (x) for the word spacing to allow before invoking letterspacing. More precisely, it specifies a limitation on the effect of a "letterspacing" value; letterspacing may be used in the line-breaking algorithm within a given line-area when otherwise the word-spacing value would be greater than x." Critical is used, not max or min? No indication of which side of the value causes a transition from word to letter spacing? A length is used, yet the description talks of a limitation (on what?). The requirement says "Allow users to specify the priority between word and letter spacing." I'm guessing that when word spacing exceeds this value, letter-spacing is used? 1. Does it meet the requirement (no mention of which of the two has priority). 2. I don't find the property name at all intuitive wrt purpose. 3. The description is unclear IMHO.