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

    Adds more functionality to XHR (aka AJAX) requests like file uploads, transfer progress information and the ability to send form data. 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. xmlhttprequest api

  4. xmlhttprequesteventtarget api

  5. xmlhttprequestupload api

  6. xmlhttprequestupload api: `abort` event

  7. xmlhttprequestupload api: `error` event

  8. xmlhttprequestupload api: `loadend` event

  9. xmlhttprequestupload api: `loadstart` event

  10. xmlhttprequestupload api: `load` event

  11. xmlhttprequestupload api: `progress` event

  12. xmlhttprequestupload api: `timeout` event

  13. xmlhttprequest api: abort

  14. xmlhttprequest api: `abort` event

  15. xmlhttprequest api: `error` event

  16. xmlhttprequest api: getallresponseheaders

  17. xmlhttprequest api: getresponseheader

  18. xmlhttprequest api: `loadend` event

  19. xmlhttprequest api: `loadstart` event

  20. xmlhttprequest api: `load` event

  21. xmlhttprequest api: open

  22. xmlhttprequest api: overridemimetype

  23. xmlhttprequest api: `progress` event

  24. xmlhttprequest api: readystate

  25. xmlhttprequest api: `readystatechange` event

  26. xmlhttprequest api: response

  27. xmlhttprequest api: responsetext

  28. xmlhttprequest api: responsetype

  29. xmlhttprequest api: responsetype: arraybuffer

  30. xmlhttprequest api: responsetype: blob

  31. xmlhttprequest api: responsetype: document

  32. xmlhttprequest api: responsetype: json

  33. xmlhttprequest api: responseurl

  34. xmlhttprequest api: responsexml

  35. xmlhttprequest api: send

  36. xmlhttprequest api: send: arraybuffer as parameter to send()

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

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

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

  40. xmlhttprequest api: setrequestheader

  41. xmlhttprequest api: status

  42. xmlhttprequest api: statustext

  43. xmlhttprequest api: timeout

  44. xmlhttprequest api: `timeout` event

  45. xmlhttprequest api: upload

  46. xmlhttprequest api: withcredentials

  47. xmlhttprequest api: available in workers

  48. xmlhttprequest api: `xmlhttprequest()` constructor

  49. types: `<length-percentage>`: `lh` unit

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