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Using FormData Objects

The FormData object lets you compile a set of key/value pairs to send using XMLHttpRequest. It is primarily intended for use in sending form data, but can be used independently from forms in order to transmit keyed data. The transmitted data is in the same format that the form's submit() method would use to send the data if the form's encoding type were set to multipart/form-data.
AJAX Blob File FormData Forms XHR XMLHttpRequest

Blob()

The Blob() constructor returns a new Blob object. The content of the blob consists of the concatenation of the values given in the parameter array.
API Blob Constructor Experimental Expérimental File API Reference Référence