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Tommy Olsson and Paul O'Brien

"The Ultimate CSS Reference"

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Internet Explorer for Windows versions up to and including 6 do not support
transparent borders.
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 spaces within the border. When the element doesn??™t have a layout, the
background will extend under the borders.
The appearance of the borders may vary between user agents (within limits). The
algorithms that define the relationship between the colors used to achieve an effect
(for example, groove, ridge, inset, and outset) are not explicitly defined in the
CSS specifications, so the colors may vary between user agents. In CSS2.1, the
three-dimensional border styles (groove, ridge, inset, and outset) depend on the
corresponding border-color, rather than on color.


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