https://bugzilla.wikimedia.org/show_bug.cgi?id=17297

--- Comment #14 from Philippe Verdy <[email protected]> 2012-10-07 18:11:27 
UTC ---
Are you sure that superscripts and subscripts will use the same font as the
rest of the text ? My opinion is that this explicit setting of line-height with
a unit should be reserved only to superscripts generated for example by note
calls and references, or abreviation marks like "st", "nd", "rd", for which the
content of the superscript is predicatble (eventually generated by a template),
but not for all general superscripts for which you don't know what is written
inside (and notably is it contains text in another script or language).

Given that the default line-height now is 1.2 (instead of 1.4 before), the
superscript may easily overlap the line above. There are also accessibility
considerations, because some users will want to avoid all reduction of font
sizes for superscripts or subscripts, to keep the text readable, even if this
cause the line-gap to be unevenly distributed.

Also some browsers won't be able to reduce the font size for superscripts or
subscripts below some level (for example on some low resolution screens, or on
small displays like smartphones, where fonts are already small by default and
there's a minimum font size defined in the browser's user preferences in order
to allow text selection and better readability), and will need that the
line-height becomes adaptative, without overlaps caused by an insufficient
fixed line-height.

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