delayed_window_print.html

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This WPT test may be referenced by the following Test IDs:
- /dom/delayed_window_print.html - WPT Dashboard Interop Dashboard

<!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>