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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/scripting/events/body-onload.html 

<!DOCTYPE html>
<title>HTMLBodyElement.onload</title>
<link rel="author" title="Boris Zbarsky" href="mailto:[email protected]">
<link rel="author" title="Ms2ger" href="mailto:[email protected]">
<link rel="help" href="https://html.spec.whatwg.org/multipage/#handler-window-onload">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
var t = async_test("body.onload should set the window.onload handler")
window.onload = t.step_func(function() {
  assert_unreached("This handler should be overwritten.")
})
var b = document.createElement("body")
b.onload = t.step_func(function(e) {
  assert_equals(e.currentTarget, window,
                "The event should be fired at the window.")
  t.done()
})
</script>