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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>