iframe-unload.html

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This WPT test may be referenced by the following Test IDs:
- /page-visibility/iframe-unload.html - WPT Dashboard Interop Dashboard

<html>

<title>visibilitychange fires on unload with iframes</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<script>

var frameDocs = [];

var docsLoaded = 0;

var numFrames = 3;

var ast = new async_test("visibilitychange fires on unload with iframes");

function startTest() {

  if (++docsLoaded < numFrames)

    return;

  ast.step(function () {

    frameDocs.push(window[0].document);

    frameDocs.push(window[0][0].document);

    frameDocs.push(window[0][1].document);

    for (var i = 0; i < frameDocs.length; ++i) {

      frameDocs[i].addEventListener(

          "visibilitychange",

          onVisibilityChange.bind(null, i), false);

    document.body.removeChild(document.getElementById("frame1"));

});

var checkedFrames = 0;

function onVisibilityChange(i) {

  ast.step(function () {

    assert_equals(frameDocs[i].visibilityState, "hidden");

});

  if (++checkedFrames >= numFrames) {

    ast.done();

</script>

<iframe id="frame1" src="resources/iframe-with-subframes.html"></iframe>

</body>

</html>