HTML 5.1

W3C Recommendation, 1 November 2016

4.14. Disabled elements

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

a button element that is disabled
an input element that is disabled
a select element that is disabled
a textarea element that is disabled
an optgroup element that has a disabled attribute
an option element that is disabled
a menuitem element that has a disabled attribute
a fieldset element that is a disabled fieldset

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

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