test_frame_visibility_in_iframe.html

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<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<p id="display"></p>

<div id="content" style="display: none"></div>

<pre id="test"></pre>

<script>

SimpleTest.waitForExplicitFinish();

SpecialPowers.pushPrefEnv(

    // Set layout.visibility.min-recompute-interval-ms to 0ms so that

    // ScheduleApproximateFrameVisibilityUpdateNow gets called on every frame

    // we flush layout.

    set: [ ["layout.visibility.min-recompute-interval-ms", 0] ],

},

  () =>

    window.open("frame_visibility_in_iframe.html", "_blank");

);

</script>

</body>

</html>