Group together related options with <optgroup> tags:
The <optgroup> tag is used to group together related options in a select list.
If you have a long list of options, groups of related options are easier to handle for the
The <optgroup> tag is supported in all major browsers.
DTD indicates in which HTML 4.01/XHTML 1.0 DTD the
attribute is allowed. S=Strict, T=Transitional, and F=Frameset.
The <optgroup> tag supports the following standard attributes:
More information about Standard Attributes.
The <optgroup> tag supports the following event attributes:
More information about Event Attributes.
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