border-top-width property - script-tutorials.com

Definition and Usage

The border-top-width CSS property sets the width of the top border of a box.

Initialmedium
Applies toall elements
Inheritedno
Mediavisual
Computed Valuethe absolute length or 0 if border-top-style is none or hidden
Animatableyes, as a length
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Syntax

Formal syntax: <br-width>

border-top-width: 10em    /* Any <length> value */
border-top-width: 3vmax
border-top-width: 6px
border-top-width: thin    /* A keyword */
border-top-width: medium
border-top-width: thick
border-top-width: inherit

Values

<br-width>

Is either a non-negative explicit <length> value or a keyword denoting the thickness of the bottom border. The keyword must be one of the following values:

Style	Preview	Description
`thin`		A thin border
`medium`		A medium border
`thick`		A thick border

The specification doesn’t precisely define the thickness of each of the keywords, which is therefore implementation specific. Nevertheless, it requests that the thickness does follow the thin ≤ medium ≤ thick inequality and that the values are constant on a single document.

inherit

Represents the calculated value of the border-top-width of the parent’s element.

Examples

1
element {

2
    border-top-width: thin;

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    border-top-style: solid;

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    border-top-color: #000;

5
}

1
.element1{

2
        border-top: thick solid red;

3
}

4
.element2{

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        border-top: medium solid orange;

6
}

7
.element3{

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        border-top: thin solid green;

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}

Live Sample

Element 1

Element 2

Element 3

Compatibility

Desktop browsers

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	1.0	1.0 (1.0)	4.0	3.5	1.0 (85)

Mobile browsers

Feature	Android	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	NA	NA	NA	NA	NA