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HTML 4.01 and XHTML 1.0 Reference: <optgroup> Tag

HTML <optgroup> Tag - Option Group
Syntax This element uses separate opening and closing tags.
<optgroup>...</optgroup>
Usage The <optgroup> tag is used to group related <option> tags into logical groupings. The <option> tags are used within a select element to create a menu or scrolling list.

HTML <optgroup> tag example.
<form action="example_input.php" method="post">
<p>
 <select name="seltest" title="numbers">
  <option>none</option>
  <optgroup label="single digit">
   <option>one</option>
   <option selected="selected">two</option>
   <option>three</option>
  </optgroup>
  <optgroup label="double digit">
   <option>ten</option>
   <option>eleven</option>
   <option>twelve</option>
  </optgroup>
 </select>  
 <input type="submit" value="Send"> <input type="reset">
</p>
</form>
Test It HTML Style

XHTML <optgroup> tag example.
<form action="example_input.php" method="post">
<p>
 <select name="seltest" title="numbers">
  <option>none</option>
  <optgroup label="single digit">
   <option>one</option>
   <option selected="selected">two</option>
   <option>three</option>
  </optgroup>
  <optgroup label="double digit">
   <option>ten</option>
   <option>eleven</option>
   <option>twelve</option>
  </optgroup>
 </select>  
 <input type="submit" value="Send" /> <input type="reset" />
</p>
</form>
Test It XHTML Style

Content Model The <optgroup> element can contain the following tags between its opening and closing tags.

<optgroup> Tag Attribute Summary
Required Tag Specific Core Focus Events Language
label disabled id class style title   onclick ondblclick onkeydown onkeypress onkeyup onmousedown onmousemove onmouseout onmouseover onmouseup dir lang xml:lang1
Notes: 1. XHTML only.

<optgroup> Tag Attributes
Attribute Description
labelThe label attribute specifies a label for the group of options.

Note: This is a required attribute.
disabledThe disabled attribute is used to disable the group of options so that they cannot be selected.

HTML <optgroup> tag example using the disabled attribute.
<form action="example_input.php" method="post">
<p>
 <select name="seltest" title="numbers">
  <option>none</option>
  <optgroup label="single digit">
   <option>one</option>
   <option selected="selected">two</option>
   <option>three</option>
  </optgroup>
  <optgroup label="double digit" disabled="disabled">
   <option>ten</option>
   <option>eleven</option>
   <option>twelve</option>
  </optgroup>
 </select>  
 <input type="submit" value="Send"> <input type="reset">
</p>
</form>
Test It HTML Style

XHTML <optgroup> tag example using the disabled attribute.
<form action="example_input.php" method="post">
<p>
 <select name="seltest" title="numbers">
  <option>none</option>
  <optgroup label="single digit">
   <option>one</option>
   <option selected="selected">two</option>
   <option>three</option>
  </optgroup>
  <optgroup label="double digit" disabled="disabled">
   <option>ten</option>
   <option>eleven</option>
   <option>twelve</option>
  </optgroup>
 </select>  
 <input type="submit" value="Send" /> <input type="reset" />
</p>
</form>
Test It XHTML Style

idThe id attribute assigns a unique name to a tag. This allows style sheets or scripts to reference the tag. See id Example
classThe class attribute assigns a class name to a tag. The class name does not need to be unique. More than one tag can have the same class name. This allows style sheets or scripts to reference multiple tags with a single class name. See class Example
styleThe style attribute specifies styles for the tag. For Cascading Style Sheets (CSS), the syntax is name:value. Each name:value pair is separated by semicolons. See style Example
titleThe title attribute specifies additional information about the tag. It is common for browsers to display the title when the pointing device stops over the object. See title Example
onclickThe onclick attribute specifies a script to be run when the object is clicked with a mouse or other pointing device. See onclick Example
ondblclickThe ondblclick attribute specifies a script to be run when the object is double clicked with a mouse or other pointing device. See ondblclick Example
onkeydownThe onkeydown attribute specifies a script to be run when a key is pressed down. See onkeydown Example
onkeypressThe onkeypress attribute specifies a script to be run when a key is pressed and released. See onkeypress Example
onkeyupThe onkeyup attribute specifies a script to be run when a key is released. See onkeyup Example
onmousedownThe onmousedown attribute specifies a script to be run when the mouse button, or other pointing device button, is pressed while over the object. See onmousedown Example
onmousemoveThe onmousemove attribute specifies a script to be run when the mouse, or other pointing device, is moved while it is over the object. See onmousemove Example
onmouseoutThe onmouseout attribute specifies a script to be run when the mouse, or other pointing device, is moved away from an object after being over it. See onmouseout Example
onmouseoverThe onmouseover attribute specifies a script to be run when the mouse, or other pointing device, is moved onto the object. See onmouseover Example
onmouseupThe onmouseup attribute specifies a script to be run when the mouse button, or other pointing device button, is released while over the object. See onmouseup Example
dirThe dir attribute tells the browser whether the text should be displayed from left-to-right or right-to-left. It does not reverse the direction of the characters, like the <bdo> tag does, but it can help the browser to determine if the text should be aligned on the left side or the right side. See dir Example
langThe lang attribute specifies a language. This attribute can help the browser to correctly display text. This attribute can also be useful for braille translation software, speech synthesizers, dictionary definitions, etc. See lang Example
xml:langThe xml:lang attribute specifies a language for XHTML documents. This attribute can help the browser to correctly display text. This attribute can also be useful for braille translation software, speech synthesizers, dictionary definitions, etc. See xml:lang Example

Note: XHTML only.

HTML <optgroup> Tag Examples
Test It HTML StyleTest It HTML Style<optgroup> tag example.
Test It HTML StyleTest It HTML Style<optgroup> tag example using the disabled attribute.