This property controls the thickness (width) of the bottom border of an
element's rendering box. Negative values are not allowed.
Allowed Values
inherit
[CSS2] [N6|O7]
Type: Explicit
Description:
Explicitly sets the value of this property to that of the parent.
thin | medium |
thick
[CSS1|CSS2]
[IE4B2|N4B3|O3.5]
Type: Calculated
Description:
Renders a "thin", "medium" or "thick" border
on the bottom side of the element's rendering box. The actual thickness of
these border values is not specified, but "thin" should have a
smaller thickness than "medium", which should have a smaller
thickness than "thick".
[length]
[CSS1|CSS2]
[IE4B2|N4B3|O3.5]
Type: Explicit
Description:
Sets the width of the border on the bottom side of the element's rendering box
to an explicit measurement.
Example
Ext/Doc: strong {
border-bottom-width: medium }
In-Line: <strongSTYLE="border-bottom-width:
medium">this is a beautiful test</strong>
Browser Peculiarities
Internet Explorer
4.0:
- This property does not apply to input TYPE=checkbox/radio fields
- Applying border properties to list items skews the normal placement of the marker
4.0+:
- The default 'border-style' for form fields and tables/table cells
is not "none."
- Using a 'border-style' of "double" with 'border-width' set to "thin"
produces a solid, thin border, not a double border.
4.0-5.0:
- This property does not apply to inline elements.
5.0:
- A static size is given to input TYPE=checkbox/radio fields.
Borders are rendered within this. Depending on the border-width,
this can possibly obscure part or all of the field.
5.5+:
- Beginning in 5.5 Beta 1, this property now applies to inline elements.
Netscape
4.0:
- Inline elements are turned into block elements when Border properties are applied.
- Border properties have no effect on tables and table cells
- Border properties applied to form fields and images: creates a linefeed
after the element followed by a small box carrying the border property/value.
- Border properties applied to list items (LI) and DT/DD:
creates a small box carrying the border property/value, followed by
a linefeed, followed by the list item content.
- Border properties applied to list structures (OL/UL): causes the list
markers to be shown as small bullets, regardless of the 'list-style-type'
applied.
- The default value for 'border-style' is "solid", not "none". The
default value for 'border-width' is "0", not "medium."
- Border properties applied to hyperlinks make the hyperlink unusable!
- Border styles applied to unclosed P element, nested inside a floating
element: all content after opening P element disappears.
- Reported elsewhere: Crash when border applied to unclosed P element
in table cell, while another table is nested in the cell (verified in
4.0x,NT but appears ok in 4.5x,98)
- Even if the 'border-style' is set to "none", an element is rendered
with space allowance for any indicated 'border-width' value.
- Reported elsewhere: Assigning border properties to elements with
'width' set to "100%" can cause unnecessary linefeeds when printing.
Opera
3.5:
- Borders have no effect on images, tables, table cells and form fields.
- Using a 'border-style' of "double" with 'border-width' set to "thin"
produces a solid, thin border, not a double border.