1. htmlbuttonelement api: popovertargetaction

2. htmlbuttonelement api: popovertargetelement

3. htmlbuttonelement api: popovertargetelement: implicit anchor reference via `popovertargetelement`

4. htmlelement api: `beforetoggle` event: `beforetoggle` event fires at popover elements

5. htmlelement api: hidepopover

6. htmlelement api: popover

7. htmlelement api: popover: `hint` value

8. htmlelement api: showpopover

9. htmlelement api: showpopover: `options.source` parameter

10. htmlelement api: showpopover: `options.source` parameter: implicit anchor reference via `source`

11. htmlelement api: togglepopover

12. htmlelement api: togglepopover: `force` parameter

13. htmlelement api: togglepopover: `options.force` parameter

14. htmlelement api: togglepopover: `options.source` parameter

15. htmlelement api: togglepopover: `options.source` parameter: implicit anchor reference via `source`

16. htmlelement api: togglepopover: returns `true` or `false`

17. htmlelement api: `toggle` event: `toggle` event fires at popover elements

18. htmlinputelement api: popovertargetaction

19. htmlinputelement api: popovertargetelement

20. htmlinputelement api: popovertargetelement: implicit anchor reference via `popovertargetelement`