Bug 1151421 Part 2: Add test of fractional scroll position properties.
MozReview-Commit-ID: 4a8eQeJz7fV
new file mode 100644
--- /dev/null
+++ b/docshell/test/file_bug1151421.html
@@ -0,0 +1,19 @@
+<html>
+<head>
+<style>
+body, html {
+ height: 100%;
+}
+.spacer {
+ height: 80%;
+}
+</style>
+</head>
+<body onload='(parent || opener).childLoad()'>
+
+<div class="spacer"></div>
+<div id="content">content</div>
+<div class="spacer"></div>
+
+</body>
+</html>
--- a/docshell/test/mochitest.ini
+++ b/docshell/test/mochitest.ini
@@ -28,16 +28,17 @@ support-files =
file_bug653741.html
file_bug660404
file_bug660404^headers^
file_bug662170.html
file_bug669671.sjs
file_bug680257.html
file_bug703855.html
file_bug728939.html
+ file_bug1151421.html
file_pushState_after_document_open.html
historyframes.html
[test_anchor_scroll_after_document_open.html]
[test_bfcache_plus_hash.html]
[test_bug123696.html]
[test_bug369814.html]
[test_bug384014.html]
@@ -81,16 +82,17 @@ support-files = file_bug668513.html
[test_bug691547.html]
[test_bug694612.html]
[test_bug703855.html]
[test_bug713825.html]
[test_bug728939.html]
[test_bug797909.html]
[test_bug1045096.html]
[test_bug1121701.html]
+[test_bug1151421.html]
[test_bug1186774.html]
[test_forceinheritprincipal_overrule_owner.html]
[test_framedhistoryframes.html]
skip-if = toolkit == 'android' # bug 784321
support-files = file_framedhistoryframes.html
[test_pushState_after_document_open.html]
[test_windowedhistoryframes.html]
[test_triggeringprincipal_location_seturi.html]
new file mode 100644
--- /dev/null
+++ b/docshell/test/test_bug1151421.html
@@ -0,0 +1,61 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1151421
+-->
+<head>
+ <title>Test for Bug 1151421</title>
+ <script type="application/javascript" 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 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>