HTML Reference : HTML Elements :
OPTGROUP

Attribute Information

class (coreattrs)   CDATA

id (coreattrs)   ID

language (coreattrs)

style (coreattrs)   CDATA

title (coreattrs)   CDATA

onclick (events)

ondblclick (events)

onkeydown (events)

onkeypress (events)

onkeyup (events)

onmousedown (events)

onmousemove (events)

onmouseout (events)

onmouseover (events)

onmouseup (events)

dir (i18n)   ltr rtl

lang (i18n)   CDATA

disabled

label

DTD Information
The DTD defines the set of elements that can be properly contained within the element.

OPTION