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

--- Comment #15 from Philippe Verdy <[email protected]> 2012-10-07 18:25:11 
UTC ---
Note also that I hope that some day browsers will have a new accessibility
option for allowing users to specify a minimum line-height for everything: a
line-height of 1.2 is difficult to follow for many people that have vision or
brain problems, they prefer texts with line height a minimum of 1.4 or 1.5,
even if it takes more space on screen.

If the browser proposes this accessibility option (in addition to the minimum
font sizes), then the evenly distributed line-height in paragraphs will not be
sustainable without creating overlaps problems.

For the same reason, line-widths may be setup by users to not exceed some ems,
because people have difficulties to follow very long lines and return to the
next line (notably if the line-height is very narrow). With an accessibility
option, the browsers may propose them to restrict paragraphs widths to no more
than 40em or 60em (even if this creates large blank margins in the layout),
even if the default is to allow arbitrary long lines in browsers.

This is a good reason why most newspapers and books prefer to use blocks
rendered in multiple columns (to save paper space), as they are easier to read,
especially at small font sizes (e.g. in phone diaries and dictionaries, or
classified ads).

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