HTML 5.1

W3C Working Draft,

4.14. Disabled elements

An element is said to be actually disabled#disablingReferenced in:4.10.9. The optgroup element4.15.2. Pseudo-classes5.4.2. Data model (2)5.4.3. The tabindex attribute if it falls into one of the following categories:

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

4.13 Common idioms without dedicated elementsTable of contents4.15 Matching HTML elements using selectors