File: delayed_window_print.html

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<!doctype html>
<meta charset=utf-8>
<title>Test for delaying window.print() before load</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<body>
<script>
let t = async_test("Delayed print before load");
let beforePrintCalled = false;
window.addEventListener("beforeprint", t.step_func(function() {
  assert_false(beforePrintCalled, "Should only call beforeprint once");
  beforePrintCalled = true;
  assert_true(
    !!document.getElementById("before-load"),
    "Should show contents that get added before load"
  );
  assert_true(
    !!document.getElementById("during-load"),
    "Should show contents that get added during load"
  );
  setTimeout(function() { t.done(); }, 0);
}));

t.step(function() {
  window.print();

  let div = document.createElement("div");
  div.id = "before-load";
  document.body.appendChild(div);
});

window.addEventListener("load", t.step_func(function() {
  window.print();

  let div = document.createElement("div");
  div.id = "during-load";
  document.body.appendChild(div);
}));
</script>