Absolute positioning: the 'auto' value

1. Only the positioned box

'top: auto' 'left: auto'

'top: auto' 'right: auto'

'bottom: auto' 'left: auto'

'bottom: auto' 'right: auto'

'top: auto' 'right: auto' 'bottom: auto' 'left: auto'

'top: auto' 'left: <length>'

'top: auto' 'right: <length>'

'bottom: auto' 'left: <length>'

'bottom: <length>' 'left: auto'

2. Inserting an element before the positioned box

'top: auto' 'left: auto'

'top: auto' 'right: auto'

'bottom: auto' 'left: auto'

'bottom: auto' 'right: auto'

'top: auto' 'right: auto' 'bottom: auto' 'left: auto'

'top: auto' 'left: <length>'

'top: auto' 'right: <length>'

'bottom: auto' 'left: <length>'

'bottom: <length>' 'left: auto'