Quote:
Originally Posted by Jellby
Even if there were some study about the optimal line separation, there's no way it can be applied to CSS properties, because the result is completely dependent on the font metrics. Not only on whether the font has a large or small x-height, ascenders, etc. but on some arbitrary values in the font file, which you can change at will, and will cause the same "line-height" value to be rendered differently.
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+1
Any discussion of line height, (real typographic term is leading) has to take in consideration the various fonts' x-height (height of lower case letters relative to the font's point size). The line height (leading) that leads to the most readability will vary based on the font's x-height. Other factors in the design of the glyphs and other font metrics, like letter spacing and kerning, also contribute.