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Unit-less value vs. ems/%
Just to clarify. What is the reason that you would use the unit-less value rather than ems or % to define line height?? My assumption is the unit-less value does not derive its original value from the parent element. Is this right?
Steven Parker228,039 Points
The unit-less value is a multiplier of the current font size.
By using a unit-less value, then if you change the font size later, the line-height will adjust so the proportions to the font are still the same.
The only relationship to the parent is that the font size is normally inherited.