1. css property: position-area: span-block-end

2. css property: position-area: span-self-block-end

3. css property: position-try-fallbacks: span-block-end

4. css property: position-try-fallbacks: span-self-block-end

5. css property: position-try: span-block-end

6. css property: position-try: span-self-block-end