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.
formdata api
formdataevent api
formdataevent api: formdata
formdataevent api: `formdataevent()` constructor
formdata api: [symbol.iterator]
formdata api: append
formdata api: append: `filename` parameter
formdata api: delete
formdata api: entries
formdata api: foreach
formdata api: `formdata()` constructor
formdata api: `formdata()` constructor: `submitter` parameter
formdata api: get
formdata api: getall
formdata api: has
formdata api: keys
formdata api: set
formdata api: values
formdata api: available in workers
htmlformelement api: `formdata` event
navigateevent api: formdata
request api: formdata
response api: formdata
xmlhttprequest api: send: formdata as parameter to send()
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