| <!DOCTYPE html> | 
 | <html> | 
 | <head> | 
 |  <script src="/resources/testharness.js"></script> | 
 |  <script src="/resources/testharnessreport.js"></script> | 
 |  <title>XMLHttpRequest: sync requests should block events on pending async requests</title> | 
 | </head> | 
 |  | 
 | <body> | 
 |  <div id="log"></div> | 
 |  | 
 |  <script type="text/javascript"> | 
 |  var test = async_test(); | 
 |  | 
 |  var expect = ['sync 4', 'async 2', 'async 3', 'async 4'] | 
 |  var actual = [] | 
 |  | 
 |  test.step(function() | 
 |  { | 
 |  var xhr_async = new XMLHttpRequest() | 
 |  xhr_async.open('GET', 'resources/delay.py?ms=1000', true) // first launch an async request, completes in 1 second | 
 |  xhr_async.onreadystatechange = test.step_func(() => { | 
 |  actual.push('async ' + xhr_async.readyState) | 
 |  if(xhr_async.readyState === 4 && actual.indexOf('sync 4')>-1){ | 
 |  VerifyResult() | 
 |  } | 
 |  }); | 
 |  xhr_async.send() | 
 |  | 
 |  test.step_timeout(() => { | 
 |  var xhr_sync = new XMLHttpRequest(); | 
 |  xhr_sync.open('GET', 'resources/delay.py?ms=2000', false) // here's a sync request that will take 2 seconds to finish | 
 |  xhr_sync.onreadystatechange = test.step_func(() => { | 
 |  actual.push('sync ' + xhr_sync.readyState) | 
 |  if(xhr_sync.readyState === 4 && actual.indexOf('async 4')>-1){ | 
 |  VerifyResult() | 
 |  } | 
 |  }); | 
 |  xhr_sync.send() | 
 |  }, 10); | 
 |  | 
 |  function VerifyResult() | 
 |  { | 
 |  test.step(function() | 
 |  { | 
 |  assert_array_equals(actual, expect); | 
 |  test.done(); | 
 |  }); | 
 |  }; | 
 |  }); | 
 |  </script> | 
 | </body> | 
 | </html> |