HTML 5.1

4.14 Disabled elements

An element is said to be actually disabled if it falls into one of the following categories:

• button elements that are disabled
• input elements that are disabled
• select elements that are disabled
• textarea elements that are disabled
• optgroup elements that have a disabled attribute
• option elements that are disabled
• menuitem elements that have a disabled attribute
• fieldset elements that have a disabled attribute

This definition is used to determine what elements can be focused and which elements match the :disabled pseudo-class.