The CSS reference
"border-top-width" - css property (v. css 1)
- Sets the width of an element's top border.
- To set all border equal width use 'border-width' .
- Initial value: medium
- The property is not inherited
- HTML usage: all elements
- Can be given as 'inherit' or a width as specified below.
- The 'inherit' is a CSS 2 property value.
-
Browsers that support the border-top-width - property :
Possible width values:
Values | Comments | CSS |
---|---|---|
thin, medium or thick | The width of the keyword values are UA dependent, but the following holds: 'thin' <= 'medium' <= 'thick'. | 1 |
length | With this you specify a value with a unit identifier. | 1 |
inherit | Will inherit the value from parent specification. This property value is new with CSS 2. | 2 |
Possible unit identifier:
unit identifier | Comments | CSS |
---|---|---|
em | The relative unit 'em' is relative to the font size of the element itself. | 1 |
ex | The relative unit 'ex' is relative to the font size of the element itself. | 1 |
px | Pixels, relative to the viewing device | 1 |
in | inches -> 1 inch is equal to 2.54 centimeters. | 1 |
cm | centimeters. | 1 |
mm | millimeters. | 1 |
pt | points -> the points used by CSS2 are equal to 1/72th of an inch. | 1 |
pc | picas -> 1 pica is equal to 12 points. | 1 |
Property "border-top-width" example:
<!DOCTYPE HTML >
<html >
<head>
<title>Test</title>
<style type="text/css">
.presentation {
border-top-color: #4DFFFF;
border-top-style: dotted;
border-top-width: 22px;
width: 400px;
}
</style>
</head>
<body>
<div class='presentation' >The Inherit value is inherited from
the parent specification. This property value is new
with CSS 2.
</div>
</body>
</html>
Javascript access:
// To SET values ([o] is the target object)
[o].style.borderTopWidth="border-top-width value"
// To GET values you must first get the computed style object
// To get that object in IE or Opera:
var cStyle=[o].currentStyle;
// To get that object in Firefox, Chrome or Safari (w3c-type):
var cStyle=window.getComputedStyle([o],null)
// To GET the property value:
var value=cStyle.borderTopWidth;
/* Don't expect to get the initial value
for a NOT pre-set border width.*/
/* IE and Opera will return a value in units as used with a Set.
Firefox will return a calculated float value in pixel(px).
Chrome or Safari will return a calculated int value in pixel(px)*/
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