border-width
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
Summary
CSS-свойство border-width
определяет ширину рамки элемента. Но обычно её задают не отдельно, а в составе свойства border
.
Синтаксис
border-width =
<line-width>{1,4}
<line-width> =
<length [0,∞]> |
thin |
medium |
thick
border-width: ширина /* Одно значение */
border-width: вертикальная горизонтальная /* Два значения */
border-width: верх горизонтальная основание /* Три значения */
border-width: верх право основание лево /* Четыре значения */
border-width: inherit /* Родительское значение */
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:-
thin
-
medium
-
thick
Примечание: 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
-
Is a keyword indicating that all four values are inherited from their parent's element calculated value.
Examples
A mix of values and lengths
HTML
<p id="sval">one value: 6px wide border on all 4 sides</p>
<p id="bival">
two different values: 2px wide top and bottom border, 10px wide right and left
border
</p>
<p id="treval">
three different values: 0.3em top, 9px bottom, and zero width right and left
</p>
<p id="fourval">
four different values: "thin" top, "medium" right, "thick" bottom, and 1em
right
</p>
CSS
#sval {
border: ridge #ccc;
border-width: 6px;
}
#bival {
border: solid red;
border-width: 2px 10px;
}
#treval {
border: dotted orange;
border-width: 0.3em 0 9px;
}
#fourval {
border: solid lightgreen;
border-width: thin medium thick 1em;
}
p {
width: auto;
margin: 0.25em;
padding: 0.25em;
}
Result
Спецификации
Specification |
---|
CSS Backgrounds and Borders Module Level 3 # the-border-width |
Совместимость с браузерами
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Смотрите также
- The border-related shorthand properties:
border
,border-style
,border-color
- The border-width-related properties:
border-bottom-width
,border-left-width
,border-right-width
,border-top-width