Tab Order
When a page or other delivery unit is navigated sequentially, elements receive focus in an order that follows relationships and sequences in the content.Comments on the Reference (Success Criteria)
Accessibility Issue
The intent of this success criterion is to ensure that when users navigate sequentially through content, they encounter information in an order that reflects the relationships in the content. This reduces confusion by letting users form a consistent mental model of the content.Some Web content supports sequential navigation. For example, a person using a keyboard or keyboard interface to complete an online form typically uses the tab key to move from one input element to the next item on the form. Each time the user presses the tab key, another element receives focus (that is, the user's next action will affect the item that has focus). In some cases it may be necessary to specify the sequence in which items will receive focus, because the default sequence is not logical.
