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chromium/third_party/blink/web_tests/external/wpt/xhr/timeout-multiple-fetches.html 

<!doctype html>
<title>XMLHttpRequest: timeout, redirects, and CORS preflights</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/common/get-host-info.sub.js></script>
<script src=/common/utils.js></script>
<div id=log></div>
<script>
async_test(t => {
  const client = new XMLHttpRequest
  client.open("GET", "resources/redirect.py?delay=500&location=delay.py") // 500 + 500 = 1000
  client.timeout = 750
  client.send()
  client.ontimeout = t.step_func_done(() => {
    assert_equals(client.readyState, 4)
  })
  client.onload = t.unreached_func("load event fired")
}, "Redirects should not reset the timer")

async_test(t => {
  // Use a unique ID to prevent caching of the preflight making the test flaky.
  const uuid = token();
  const client = new XMLHttpRequest
  client.open("YO", get_host_info().HTTP_REMOTE_ORIGIN + "/xhr/resources/delay.py?uuid=" + uuid)
  client.timeout = 750
  client.send()
  client.ontimeout = t.step_func_done(() => {
    assert_equals(client.readyState, 4)
  })
  client.onload = t.unreached_func("load event fired")
}, "CORS preflights should not reset the timer")
</script>