test_frame_reconstruction_body_writing_mode.html

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<!DOCTYPE html>

<html>

  <meta charset="utf-8">

  <title>

    Test for Bug 1593752: Test we don't reframe the html element when

    inserting a canonical body element with the same writing-mode.

  </title>

  <link rel="author" title="Ting-Yu Lin" href="tlin@mozilla.com">

  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">

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

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

  <script>

  SimpleTest.waitForExplicitFinish();

  const utils = SpecialPowers.getDOMWindowUtils(window);

  function runTest() {

    document.documentElement.offsetTop;

    // We expect to construct only the canonical body because its writing-mode

    // is the same as html's writing-mode.

    const expectedFrameConstructCount = utils.framesConstructed + 1;

    document.body.before(document.createElement("body"));

    document.documentElement.offsetTop;

    is(utils.framesConstructed, expectedFrameConstructCount,

       "We should not reframe <html>!");

    SimpleTest.finish();

  </script>

  <body onload="runTest();"></body>

</html>