XmlHttpRequest onprogress interval

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The W3 sets forth the following guidelines in their XMLHttpRequest Level 2 document. Obviously varying levels of conformance across browsers are to be expected.

Uploads:

While the request entity body is being uploaded and the upload complete flag is false, queue a task to fire a progress event named progress at the XMLHttpRequestUpload object about every 50ms or for every byte transmitted, whichever is least frequent. – W3 XMLHttpRequest Level 2 (Bolded for emphasis)

Downloads:

When it is said to make progress notifications, while the download is progressing, queue a task to fire a progress event named progress about every 50ms or for every byte received, whichever is least frequent. – W3 XMLHttpRequest Level 2 (Bolded for emphasis)

I am not aware of an api to customize this functionality.

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