A vocabulary and associated APIs for HTML and XHTML
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 disabledfieldset elements that have a disabled attributeThis definition is used to determine what elements can be focused and which elements match the :disabled pseudo-class.