This index lists some attributes in HTML that affect accessibility and what elements they apply to. The first column of this table links to the definition of the attribute in the HTML specification ( [HTML4] ). Attributes and elements that are deprecated in HTML ( [HTML4] ) are followed by an asterisk (*). Attributes and elements that are obsolete in HTML or don't exist in a W3C specification of HTML (, , ) do not appear in this table. Attributes that apply to most elements of HTML are indicated as such; please consult the HTML specification for the exact list of elements with this attribute.