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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>
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