<optgroup>

Defines a group of choices within a <select> tag. It must contain one or more <option> tags which define the actual choices.

You must enter the label attribute to specify the group label presented to the user. It should describe the group of choices available. For example:

<p>Which Web browser do you use most often?</p>
<select name="browser">
<optgroup label="Microsoft Internet Explorer">
  <option label="5.x”>Internet Explorer 5.x</option>
  <option label="4.x">Internet Explorer 4.x</option>
  <option label="3.x">Internet Explorer 3.x</option>
</optgroup>
</select>

This tag is not well supported by current browsers.

Attributes

class=type

Indicates the class to which the tag belongs. You can use the class attribute in a style sheet to create different styles that you want apply to a single HTML tag. For example, you might create three different styles for a heading <hn> tag. See Using the class attribute as a selector for more details.

disabled

Prevents the list from accepting the user's focus.

dir=ltr|rtr

Specifies the direction of text. This can be left-to-right (ltr) or right-to-left (rtl). For example, English characters are presented left-to-right, Hebrew characters are presented right-to-left.

id=value

Specifies a unique name for the tag. No two tags can have the same id on a single page. The value must begin with a letter followed by any alphanumeric character, a hyphen, an underscore, a colon or a full stop. You use it to reference a unique style for a tag or to manipulate the tag with a script.

label=text

Specify a shorter label for an option than the content of the <optgroup> tag.

lang=language

Specifies which language the <optgroup> tag uses. You can enter any valid ISO standard language abbreviation, for example, “en” for English, “de” for German and so on. For example, <span lang="es">hola! como esta?</span>.

This attribute helps search engines understand different languages as different languages rather than just misspelled English. It may also help spelling and grammar checkers and allow speech synthesizers to use language-dependent pronunciation rules.

title=text

For information only. Some browsers display the title when you move the mouse over the tag (like a tool tip).