1. naturalWidth & naturalHeight image properties

    Properties defining the intrinsic width and height of the image, rather than the displayed width & height.

  2. XMLHttpRequest advanced features

    Updated functionality to the original XHR specification including things like file uploads, transfer progress information and the ability to send FormData. Previously known as [XMLHttpRequest Level 2](https://www.w3.org/TR/2012/WD-XMLHttpRequest-20120117/), these features now appear simply in the XMLHttpRequest spec.

  3. css api: `lh()` static method

  4. xmlhttprequest api

  5. xmlhttprequesteventtarget api

  6. xmlhttprequestupload api

  7. xmlhttprequestupload api: `abort` event

  8. xmlhttprequestupload api: `error` event

  9. xmlhttprequestupload api: `loadend` event

  10. xmlhttprequestupload api: `loadstart` event

  11. xmlhttprequestupload api: `load` event

  12. xmlhttprequestupload api: `progress` event

  13. xmlhttprequestupload api: `timeout` event

  14. xmlhttprequest api: abort

  15. xmlhttprequest api: `abort` event

  16. xmlhttprequest api: `error` event

  17. xmlhttprequest api: getallresponseheaders

  18. xmlhttprequest api: getresponseheader

  19. xmlhttprequest api: `loadend` event

  20. xmlhttprequest api: `loadstart` event

  21. xmlhttprequest api: `load` event

  22. xmlhttprequest api: open

  23. xmlhttprequest api: overridemimetype

  24. xmlhttprequest api: `progress` event

  25. xmlhttprequest api: readystate

  26. xmlhttprequest api: `readystatechange` event

  27. xmlhttprequest api: response

  28. xmlhttprequest api: responsetext

  29. xmlhttprequest api: responsetype

  30. xmlhttprequest api: responsetype: arraybuffer_value

  31. xmlhttprequest api: responsetype: blob_value

  32. xmlhttprequest api: responsetype: document_value

  33. xmlhttprequest api: responsetype: json_value

  34. xmlhttprequest api: responseurl

  35. xmlhttprequest api: responsexml

  36. xmlhttprequest api: send

  37. xmlhttprequest api: send: blob as parameter to send()

  38. xmlhttprequest api: send: formdata as parameter to send()

  39. xmlhttprequest api: setattributionreporting

  40. xmlhttprequest api: setprivatetoken

  41. xmlhttprequest api: setrequestheader

  42. xmlhttprequest api: status

  43. xmlhttprequest api: statustext

  44. xmlhttprequest api: timeout

  45. xmlhttprequest api: `timeout` event

  46. xmlhttprequest api: upload

  47. xmlhttprequest api: withcredentials

  48. xmlhttprequest api: available in workers

  49. xmlhttprequest api: `xmlhttprequest()` constructor

  50. types: `<length>`: `lh` unit