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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1151421
+-->
+<head>
+ <title>Test for Bug 1151421</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1151421">Mozilla Bug 1151421</a>
+
+<script type="application/javascript">
+
+/** Test for Bug 1151421 */
+SimpleTest.waitForExplicitFinish();
+
+function childLoad() {
+ // Spin the event loop so we leave the onload handler.
+ SimpleTest.executeSoon(childLoad2);
+}
+
+function childLoad2() {
+ let iframe = document.getElementById("iframe");
+ let cw = iframe.contentWindow;
+ let content = cw.document.getElementById("content");
+
+ // Create a function to calculate an invariant.
+ let topPlusOffset = function() {
+ return Math.round(content.getBoundingClientRect().top + cw.pageYOffset);
+ };
+
+ let initialTPO = topPlusOffset();
+
+ // Scroll the iframe to various positions, and check the TPO.
+ // Scrolling down to the bottom will adjust the page offset by a fractional amount.
+ let positions = [-100, 0.17, 0, 1.5, 10.41, 1e6, 12.1];
+
+ // Run some tests with scrollTo() and ensure we have the same invariant after scrolling.
+ positions.forEach(function(pos) {
+ cw.scrollTo(0, pos);
+ is(topPlusOffset(), initialTPO, "Top plus offset should remain invariant across scrolling.");
+ });
+
+ positions.reverse().forEach(function(pos) {
+ cw.scrollTo(0, pos);
+ is(topPlusOffset(), initialTPO, "(reverse) Top plus offset should remain invariant across scrolling.");
+ });
+
+ SimpleTest.finish();
+}
+
+</script>
+
+<!-- When the iframe loads, it calls childLoad(). -->
+<br>
+<iframe height='100px' id='iframe' src='file_bug1151421.html'></iframe>
+
+</body>
+</html>