1. html element: area: ping

2. html element: audio: preload

3. html element: head: profile

4. html element: iframe: external protocol urls blocked

5. html element: link: rel: rel=preload: `as=fetch`

6. html element: link: rel: rel=preload: `as=font`

7. html element: link: rel: rel=preload: `as=image`

8. html element: link: rel: rel=preload: `as=style`

9. html element: link: rel: rel=preload: `as=track`

10. html element: link: rel: rel=prerender

11. html element: p

12. html element: param

13. html element: param: name

14. html element: param: value

15. html element: plaintext

16. html element: portal

17. html element: pre

18. html element: pre: cols

19. html element: pre: width

20. html element: progress: max

21. html element: progress: value

22. html element: textarea: placeholder

23. html element: textarea: placeholder: line breaks in `placeholder`

24. html element: video: playsinline

25. html element: video: poster

26. html element: video: preload

27. svg element: animatemotion: path

28. svg element: a: ping

29. svg element: filter: primitiveunits

30. svg element: font-face: overline-position

31. svg element: font-face: panose-1

32. svg element: font-face: underline-position

33. svg element: font-face: units-per-em

34. svg element: path

35. svg element: path: d

36. svg element: path: d: `d` as css property supports `path()`

37. svg element: pattern

38. svg element: pattern: height

39. svg element: pattern: href

40. svg element: pattern: patterncontentunits

41. svg element: pattern: patterntransform

42. svg element: pattern: patternunits

43. svg element: pattern: width

44. svg element: pattern: x

45. svg element: pattern: `xlink:href`

46. svg element: pattern: y

47. svg element: polygon

48. svg element: polygon: points

49. svg element: polyline

50. svg element: polyline: points