An element is said to be actually disabled if it falls into one of the following categories:
button elements that are disabledinput elements that are disabledselect elements that are disabledtextarea elements that are disabledoptgroup elements that have a disabled attributeoption elements that are disabledcommand elements that have a disabled attributeli elements that are children of
menu elements, and that have a child element that
defines a command, if the
first such element's Disabled State facet
is true (disabled)fieldset elements that have a disabled attributeThis definition is used to determine what elements can be focused and which elements match the :disabled pseudo-class.