<tabindex>
The
tabindex
content attribute allows authors to control whether an element is supposed to be
focusable, whether it is supposed to be reachable using sequential focus navigation,
and what is to be the relative order of the element for the purposes of sequential
focus navigation. The name "tab index" comes from the common use of the "tab" key
to navigate through the focusable elements. The term "tabbing" refers to moving forward
through the focusable elements that can be reached using sequential focus navigation.