1. textmetrics api

2. textmetrics api: actualboundingboxascent

3. textmetrics api: actualboundingboxdescent

4. textmetrics api: actualboundingboxleft

5. textmetrics api: actualboundingboxright

6. textmetrics api: alphabeticbaseline

7. textmetrics api: emheightascent

8. textmetrics api: emheightdescent

9. textmetrics api: fontboundingboxascent

10. textmetrics api: fontboundingboxdescent

11. textmetrics api: hangingbaseline

12. textmetrics api: ideographicbaseline

13. textmetrics api: width