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---
title: border-width
slug: Web/CSS/border-width
translation_of: Web/CSS/border-width
---
<div>{{CSSRef}}</div>
<h2 id="Summary">Summary</h2>
<p>CSS-свойство {{cssxref("border-width")}}<span style="line-height: 1.5;"> определяет ширину рамки элемента. Но обычно её задают не отдельно, а в составе свойства {{cssxref("border")}}.</span></p>
<p>{{cssinfo}}</p>
<h2 id="Синтаксис">Синтаксис</h2>
<pre class="twopartsyntaxbox"><a href="/en-US/docs/CSS/Value_definition_syntax" title="CSS/Value_definition_syntax">Общий синтаксис</a>: {{csssyntax("border-width")}}
</pre>
<pre>border-width: <em>ширина</em> <em> /* Одно значение */</em>
border-width: <em>вертикальная горизонтальная</em> <em> /* Два значения */</em>
border-width: <em>верх</em> <em>горизонтальная </em><em>основание</em><em> </em><em> /* Три значения */</em>
border-width: <em>верх</em> <em>право</em> <em>основание</em> <em>лево </em><em> /* Четыре значения */</em>
border-width: inherit /* Родительское значение */
</pre>
<h3 id="Values">Values</h3>
<dl>
<dt><code><br-width></code></dt>
<dd>Is either a non-negative explicit {{cssxref("<length>")}} value or a keyword denoting the thickness of the bottom border. The keyword must be one of the following values:
<table class="standard-table">
<tbody>
<tr>
<td style="vertical-align: middle;"><code>thin</code></td>
<td style="vertical-align: middle;">
<div style="margin: 0.5em; width: 3em; height: 3em; border-style: solid; border-width: thin; background-color: palegreen;"></div>
</td>
<td style="vertical-align: middle;">A thin border</td>
</tr>
<tr>
<td style="vertical-align: middle;"><code>medium</code></td>
<td style="vertical-align: middle;">
<div style="margin: 0.5em; width: 3em; height: 3em; border-style: solid; border-width: medium; background-color: palegreen;"></div>
</td>
<td style="vertical-align: middle;">A medium border</td>
</tr>
<tr>
<td style="vertical-align: middle;"><code>thick</code></td>
<td style="vertical-align: middle;">
<div style="margin: 0.5em; width: 3em; height: 3em; border-style: solid; border-width: thick; background-color: palegreen;"></div>
</td>
<td style="vertical-align: middle;">A thick border</td>
</tr>
</tbody>
</table>
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 <code>thin ≤ medium ≤ thick</code> inequality and that the values are constant on a single document.</dd>
</dl>
<p><code>inherit</code></p>
<dl>
<dd>Is a keyword indicating that all four values are inherited from their parent's element calculated value.</dd>
</dl>
<h2 id="Examples">Examples</h2>
<h3 id="A_mix_of_values_and_lengths">A mix of values and lengths</h3>
<h4 id="HTML">HTML</h4>
<pre class="brush: 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></pre>
<h4 id="CSS">CSS</h4>
<pre class="brush: 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;
}</pre>
<h4 id="Result">Result</h4>
<p>{{ EmbedLiveSample('A_mix_of_values_and_lengths', 300, 180) }}</p>
<h2 id="Specifications">Specifications</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('CSS3 Backgrounds', '#the-border-width', 'border-width')}}</td>
<td>{{Spec2('CSS3 Backgrounds')}}</td>
<td>No direct change, the {{cssxref("<length>")}} CSS data type extension has an effect on this property.</td>
</tr>
<tr>
<td>{{SpecName('CSS2.1', 'box.html#border-width-properties', 'border-width')}}</td>
<td>{{Spec2('CSS2.1')}}</td>
<td>Added the constraint that values' meaning must be constant inside a document.</td>
</tr>
<tr>
<td>{{SpecName('CSS1', '#border-width', 'border-width')}}</td>
<td>{{Spec2('CSS1')}}</td>
<td></td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{Compat("css.properties.border-width")}}</p>
<h2 id="See_also">See also</h2>
<ul>
<li>The border-related shorthand properties: {{Cssxref("border")}}, {{Cssxref("border-style")}}, {{Cssxref("border-color")}}</li>
<li>The border-width-related properties: {{Cssxref("border-bottom-width")}}, {{Cssxref("border-left-width")}}, {{Cssxref("border-right-width")}}, {{Cssxref("border-top-width")}}</li>
</ul>
|
