Tw_html.AriaAccessibility attributes following ARIA standards.
val label : string -> attrlabel "description" creates an aria-label attribute.
val labelledby : string -> attrlabelledby "id" creates an aria-labelledby attribute.
val describedby : string -> attrdescribedby "id" creates an aria-describedby attribute.
hidden is the aria-hidden="true" attribute.
val expanded : bool -> attrexpanded true creates an aria-expanded attribute.
val current : string -> attrcurrent "page" creates an aria-current attribute.
val role : string -> attrrole "navigation" creates a role attribute.