1. css property: position-area: span-self-x-start

2. css property: position-area: span-x-start

3. css property: position-try-fallbacks: span-x-self-start

4. css property: position-try-fallbacks: span-x-start

5. css property: position-try: span-x-self-start

6. css property: position-try: span-x-start