|  | <!DOCTYPE html> | 
|  | <html> | 
|  | <head> | 
|  | <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-onloadstart" data-tested-assertations="../.." /> | 
|  | <link rel="help" href="https://xhr.spec.whatwg.org/#event-xhr-loadstart" data-tested-assertations="../.." /> | 
|  | <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following::ol[1]/li[8] following-sibling::ol/li[9]/ol/li[3]" /> | 
|  |  | 
|  | <script src="/resources/testharness.js"></script> | 
|  | <script src="/resources/testharnessreport.js"></script> | 
|  | <title>XMLHttpRequest: The send() method: Fire a progress event named loadstart on the XMLHttpRequestUpload (synchronous flag is unset)</title> | 
|  | </head> | 
|  |  | 
|  | <body> | 
|  | <div id="log"></div> | 
|  |  | 
|  | <script type="text/javascript"> | 
|  | var test = async_test(); | 
|  |  | 
|  | test.step(function() | 
|  | { | 
|  | var xhr = new XMLHttpRequest(); | 
|  |  | 
|  | xhr.upload.onloadstart = function(e) | 
|  | { | 
|  | test.step(function() | 
|  | { | 
|  | assert_true(e instanceof ProgressEvent); | 
|  | assert_equals(e.type, "loadstart"); | 
|  | assert_equals(e.target, xhr.upload); | 
|  | test.done(); | 
|  | }); | 
|  | }; | 
|  |  | 
|  | xhr.open("POST", "./resources/content.py", true); | 
|  | xhr.send("Test Message"); | 
|  | }); | 
|  | </script> | 
|  | </body> | 
|  | </html> |