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diff --git a/testing/web-platform/tests/xhr/progressevent-constructor.html b/testing/web-platform/tests/xhr/progressevent-constructor.html
new file mode 100644
index 0000000000..0e771f4459
--- /dev/null
+++ b/testing/web-platform/tests/xhr/progressevent-constructor.html
@@ -0,0 +1,47 @@
+<!doctype html>
+<title>ProgressEvent constructor</title>
+<link rel="help" href="https://xhr.spec.whatwg.org/#interface-progressevent">
+<link rel="help" href="https://dom.spec.whatwg.org/#concept-event-constructor">
+<link rel="help" href="https://dom.spec.whatwg.org/#interface-event">
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<script>
+test(function() {
+  var ev = new ProgressEvent("test")
+  assert_equals(ev.type, "test")
+  assert_equals(ev.target, null)
+  assert_equals(ev.currentTarget, null)
+  assert_equals(ev.eventPhase, Event.NONE)
+  assert_equals(ev.bubbles, false)
+  assert_equals(ev.cancelable, false)
+  assert_equals(ev.defaultPrevented, false)
+  assert_equals(ev.isTrusted, false)
+  assert_true(ev.timeStamp > 0)
+  assert_true("initEvent" in ev)
+  assert_equals(ev.lengthComputable, false)
+  assert_equals(ev.loaded, 0)
+  assert_equals(ev.total, 0)
+}, "Default event values.")
+test(function() {
+  var ev = new ProgressEvent("test")
+  assert_equals(ev["initProgressEvent"], undefined)
+}, "There must not be a initProgressEvent().")
+test(function() {
+  var ev = new ProgressEvent("I am an event", { type: "trololol", bubbles: true, cancelable: false})
+  assert_equals(ev.type, "I am an event")
+  assert_equals(ev.bubbles, true)
+  assert_equals(ev.cancelable, false)
+}, "Basic test.")
+test(function() {
+  var ev = new ProgressEvent(null, { lengthComputable: "hah", loaded: "2" })
+  assert_equals(ev.type, "null")
+  assert_equals(ev.lengthComputable, true)
+  assert_equals(ev.loaded, 2)
+}, "ECMAScript value conversion test.")
+test(function() {
+  var ev = new ProgressEvent("Xx", { lengthcomputable: true})
+  assert_equals(ev.type, "Xx")
+  assert_equals(ev.lengthComputable, false)
+}, "ProgressEventInit members must be matched case-sensitively.")
+</script>