border-top-width

  • Revision slug: Web/CSS/border-top-width
  • Revision title: border-top-width
  • Revision id: 473243
  • Created:
  • Creator: ninad_ingole
  • Is current revision? No
  • Comment

Revision Content

{{CSSRef}}

Summary

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

{{cssbox("border-top-width")}}

Syntax

Formal syntax: {{csssyntax("border-top-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 {{xref_csslength}} value or a keyword denoting the thickness of the bottom border. The keyword must be one of the following values:
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

element { 
    border-top-width: thin;
    border-top-style: solid;
    border-top-color: #000;
}
.element1{
	border-top: thick solid red;
}
.element2{
	border-top: medium solid orange;
}
.element3{
	border-top: thin solid green;
}

Live Sample

Element 1
Element 2
Element 3

Specifications

Specification Status Comment
{{SpecName('CSS3 Backgrounds', '#the-border-width', 'border-top-width')}} {{Spec2('CSS3 Backgrounds')}} No significant change.
{{SpecName('CSS2.1', 'box.html#border-width-properties', 'border-top-width')}} {{Spec2('CSS2.1')}} Initial definition.

Browser compatibility

{{CompatibilityTable}}
Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 1.0 (1.0) 4.0 3.5 1.0 (85)
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support {{CompatUnknown}} {{CompatUnknown}} {{CompatUnknown}} {{CompatUnknown}} {{CompatUnknown}}

See also

  • The other border-width-related CSS properties: {{Cssxref("border-left-width")}}, {{Cssxref("border-right-width")}}, {{Cssxref("border-bottom-width")}}, and {{Cssxref("border-width")}}
  • The other border-top-related CSS properties: {{Cssxref("border")}}, {{Cssxref("border-top")}}, {{Cssxref("border-top-style")}}, and {{Cssxref("border-top-color")}}.

Revision Source

<div>
  {{CSSRef}}</div>
<h2 id="Summary" name="Summary">Summary</h2>
<p>The <code>border-top-width</code> <a href="/en-US/docs/CSS" title="CSS">CSS</a> property sets the width of the top border of a box.</p>
<p>{{cssbox("border-top-width")}}</p>
<h2 id="Syntax" name="Syntax">Syntax</h2>
<pre class="twopartsyntaxbox">
<a href="/en-US/docs/CSS/Value_definition_syntax" title="CSS/Value_definition_syntax">Formal syntax</a>: {{csssyntax("border-top-width")}}
</pre>
<pre>
border-top-width: 10em    /* Any &lt;length&gt; 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
</pre>
<h3 id="Values">Values</h3>
<dl>
  <dt>
    <code>&lt;br-width&gt;</code></dt>
  <dd>
    Is either a non-negative explicit {{xref_csslength}} 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-top-style:solid; border-top-width:thin; background-color:palegreen;">
              &nbsp;</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-top-style:solid; border-top-width:medium; background-color:palegreen;">
              &nbsp;</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-top-style:solid; border-top-width:thick; background-color:palegreen;">
              &nbsp;</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>
  <dt>
    <code>inherit</code></dt>
  <dd>
    Represents the calculated value of the <code>border-top-width</code> of the parent's element.</dd>
</dl>
<h2 id="Examples" name="Examples">&nbsp;Examples</h2>
<pre class="brush: css; highlight:[2]">
element { 
    border-top-width: thin;
    border-top-style: solid;
    border-top-color: #000;
}
</pre>
<pre class="brush: css; highlight: [2]">
.element1{
	border-top: thick solid red;
}
.element2{
	border-top: medium solid orange;
}
.element3{
	border-top: thin solid green;
}
<p>Live Sample</p>
<div class="wrapper" style="width:50%;">
  <div class="element1" style="border:1px solid black;border-top: thick solid red;margin:5px">
    Element 1</div>
  <div class="element2" style="border:1px solid black;border-top: medium solid orange;margin:5px">
    Element 2</div>
  <div class="element3" style="border:1px solid black;border-top: thin solid green;margin:5px">
    Element 3</div>
</div>
</pre>

<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-top-width')}}</td>
      <td>{{Spec2('CSS3 Backgrounds')}}</td>
      <td>No significant change.</td>
    </tr>
    <tr>
      <td>{{SpecName('CSS2.1', 'box.html#border-width-properties', 'border-top-width')}}</td>
      <td>{{Spec2('CSS2.1')}}</td>
      <td>Initial definition.</td>
    </tr>
  </tbody>
</table>
<h2 id="Browser_compatibility" name="Browser_compatibility">Browser compatibility</h2>
<div>
  {{CompatibilityTable}}</div>
<div id="compat-desktop">
  <table class="compat-table">
    <tbody>
      <tr>
        <th>Feature</th>
        <th>Chrome</th>
        <th>Firefox (Gecko)</th>
        <th>Internet Explorer</th>
        <th>Opera</th>
        <th>Safari (WebKit)</th>
      </tr>
      <tr>
        <td>Basic support</td>
        <td>1.0</td>
        <td>1.0 (1.0)</td>
        <td>4.0</td>
        <td>3.5</td>
        <td>1.0 (85)</td>
      </tr>
    </tbody>
  </table>
</div>
<div id="compat-mobile">
  <table class="compat-table">
    <tbody>
      <tr>
        <th>Feature</th>
        <th>Android</th>
        <th>Firefox Mobile (Gecko)</th>
        <th>IE Phone</th>
        <th>Opera Mobile</th>
        <th>Safari Mobile</th>
      </tr>
      <tr>
        <td>Basic support</td>
        <td>{{CompatUnknown}}</td>
        <td>{{CompatUnknown}}</td>
        <td>{{CompatUnknown}}</td>
        <td>{{CompatUnknown}}</td>
        <td>{{CompatUnknown}}</td>
      </tr>
    </tbody>
  </table>
</div>
<h2 id="See_also" name="See_also">See also</h2>
<ul>
  <li>The other border-width-related CSS properties: {{Cssxref("border-left-width")}}, {{Cssxref("border-right-width")}}, {{Cssxref("border-bottom-width")}}, and {{Cssxref("border-width")}}</li>
  <li>The other border-top-related CSS properties: {{Cssxref("border")}}, {{Cssxref("border-top")}}, {{Cssxref("border-top-style")}}, and {{Cssxref("border-top-color")}}.</li>
</ul>
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