Nesting optgroups in a dropdownlist/select

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The HTML spec here is really broken. It should allow nested optgroups and recommend user agents render them as nested menus. Instead, only one optgroup level is allowed.
However, they do have to say the following on the subject:

Note. Implementors are advised that future versions of HTML may extend the grouping mechanism to allow for nested groups (i.e., OPTGROUP elements may nest). This will allow authors to represent a richer hierarchy of choices.

And user agents could start using submenus to render optgoups instead of displaying titles before the first option element in an optgroup as they do now.

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