'position-area', 'span-start span-end', 'span-end span-start');
test_computed_value('flip-block flip-inline', 'position-area', 'self-start self-end', 'self-end self-start');
test_computed_value('flip-block flip-inline', 'position-area', 'span-self-start span-self-end', 'span-self-end span-self-start');

// center
test_computed_value('flip-block', 'position-area', 'left center', 'left center');
test_computed_value('flip-block', 'position-area', 'center top', 'center bottom');
test_computed_value('flip-block'