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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>
|
