[whatwg] Provide data chunk with the ProgressEvent

[Boris Zbarsky]

On 11/21/12 11:07 AM, Nicolas Froidure wrote:
> Indeed, the only way to access to the data chunk loaded is to keep a
> reference to the previous value of xhr.responseText.

Nicolas, see 
http://lists.w3.org/Archives/Public/public-webapps/2011JulSep/0741.html 
(implemented in Gecko as the "moz-chunked-text" and 
"moz-chunked-arraybuffer" response types so people can experiment with 
it).  Would that address your use case?

-Boris