Each form has a tab order that determines the order in which the cursor moves from field to field each time you press the Tab key. The following figure illustrates tab order.
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When you fill out a form, pressing the Tab key moves the cursor from one field
to the next in the tab order. Press Shift + Tab to move the cursor in the reverse
direction. If your form contains more than one page, when you tab out of the
last field on one page, the cursor automatically moves to the first field on
the next page. For fields that cannot have more than one line, pressing Enter
or Return has the same effect as pressing Tab.
The form author might also have configured conditional tabs for certain fields
on the form. A conditional tab moves the cursor to another area of the form
based on the information that you've entered in the field you're tabbing out
of. For example, the form author might configure conditional tabs for 'Local'
and 'Out of Town' checkboxes on a travel expense form.
If you select the 'Local' checkbox, you would tab past sections for claiming
expenses such as 'Hotel Accommodation' and 'Airline Travel,' and go directly
to sections for claiming expenses such as 'Parking' and 'Fuel.'