Name
font-weight — NN 4 IE 4 CSS 1
Synopsis
Inherited: Yes
Sets the weight (boldness) of the element’s font. CSS provides
a weight rating scheme that is more granular than most browsers
render on the screen, but the finely tuned weights may come into play
when the content is sent to a printer. The scale is a numeric rating
from 100 to 900 at 100-unit increments. Therefore, a
font-weight of 100 is the least bold that can be
displayed, whereas 900 is the boldest. A setting of
normal (the default weight for any font) is
equivalent to a font-weight value of
400; the standard bold setting is equivalent to
700. Other settings (bolder and
lighter) let you specify a weight relative to the
parent element’s weight.
The CSS2 specification offers guidelines about how the weight values
should correspond to font family names and internal characteristics
of some font definition formats. For example, the OpenType font
definition format provides slots for nine font weights. In this case,
the numeric font-weight attribute values map
directly to the weight definitions in that font. If the font family
contains a face whose name contains the word Medium and one labeled
Book, Regular, Roman, or Normal, the Medium face is equated with a
weight value of 500 (whereas the other is at
400). All font face names including the word Bold
are equated with a weight of 700. For font families that don’t have all nine weights assigned, the browser should do its best to interpolate, but it is very likely that some weight ...
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