Group related options with <optgroup> tags:
The <optgroup> tag is supported in all major browsers.
The <optgroup> is used to group related options in a drop-down list.
If you have a long list of options, groups of related options are easier to handle for a user.
|disabled||disabled||Specifies that an option-group should be disabled|
|label||text||Specifies a label for an option-group|
The <optgroup> tag also supports the Global Attributes in HTML.
The <optgroup> tag also supports the Event Attributes in HTML.
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