https://bugzilla.wikimedia.org/show_bug.cgi?id=25257
Summary: specifying font size in pixels (px) diminishes
usability
Product: MediaWiki
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Keywords: accessibility
Severity: normal
Priority: Normal
Component: Vector Skin
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
# Sizing fonts and sizing by font metrics
The only way the WWW author has to know the what size of type is well readable
by a user is the default size selected by the user. When a font is displayed at
a size smaller than the user's default font size, that creates a usability and
accessibility problem. This is more widespread a problem than only affecting
those who's eyesight is so poor that they count as disabled.
Screen resolution, in the sense of dots per inch (DPI), will determine how much
space on the display a glyph occupies, making measurements in pixels (px) an
especially ineffective unit to use in specifying typeface size.
## Units and methods for typeface sizing
Relevant information about the
(CSS properties is
at)[http://www.w3.org/TR/2009/CR-CSS2-20090908/fonts.html#font-size-props]
See also:
(Chapter 4 : The amazing em unit and other best
practices)[http://www.w3.org/WAI/GL/css2em.htm]
The Wikipedia entry on em is illuminating.
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