The keyword width values of thin, medium, and thick aren??™t explicitly defined??”their
display will depend on the user agent??”but have the following meaning: thin <=
medium <= thick.
As an example, Internet Explorer versions (up to and including 7) size thin, medium,
and thick borders at 2px, 4px, and 6px respectively, while Firefox 2.0 sizes them
at 1px, 3px, and 5px.
Compatibility
SPEC
version initial inherited
CSS1 medium NO
BROWSER SUPPORT
Op9.2+ Saf1.3+ FF1+ IE5.5+
FULL FULL FULL BUGGY
Box Properties
Opera Safari Firefox Internet Explorer
9.2 3.0 2.0 1.3 2.0 1.5 1.0 7.0 6.0 5.5
Full Full Full Full Full Full Full Buggy Buggy Buggy
User agents are supposed to place borders on the element??™s background, but in
Internet Explorer for Windows versions up to and including 7, the background only
reaches the inside edge of the border when the element has a layout (p. 158). This
means that for dotted or dashed borders, the background won??™t be visible through
The Ultimate CSS Reference 240
the spaces within the border.
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