The Assign Tab Index feature
Are Your Tab Indexes Sequenced For Accessibility and Usability?
The tabbing index establishes the order in which the user (via the keyboard) navigates to elements. Keyboard navigation is important for both accessibility and usability reasons. Keep in mind that using a mouse is difficult or impossible for some and others simply find a keyboard easier to use.
By default, the elements of a page are accessed in the same order that they were declared in code. But this order might not be the best choice in terms of usability. The tabindex attribute can be set with a completely new sequence to reorder it.
The Solution
Adding tabindex entries to any of your forms can be as easy as appending the tag tabindex="N" to every input, select, text area, or other applicable element. But it’s a tedious process if done manually.
Use this feature to review all the elements of the page that support tabbed navigation in list format. Then you enter the logical order and you’re done.
The before and validated after:
Learn more about assigning tab index order at: