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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>Test for overflow events</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<script type="application/javascript">
SimpleTest.waitForExplicitFinish();
window.addEventListener("load", function (event) {
SpecialPowers.pushPrefEnv(
{ set: [["layout.overflow-underflow.content.enabled", true]] },
function () {
if (event.target == document) {
test_bug981637();
}
}
);
});
/** Test for Bug 981637: correct overflow event firing in updateOverflow **/
var overflow_fired = false;
function overflow_listener(event) {
overflow_fired = true;
}
function test_bug981637() {
var outerDiv = document.getElementById("bug981637");
var innerDiv = outerDiv.firstChild;
innerDiv.offsetWidth; // flush layout
is(overflow_fired, false, "correct setup");
outerDiv.addEventListener("overflow", overflow_listener);
innerDiv.style.transform = "scale(1.2)";
innerDiv.offsetWidth; // flush layout
// run finish step after the overflow event fires (off the event loop)
setTimeout(test_bug981637_step2, 0);
}
function test_bug981637_step2() {
is(overflow_fired, true, "overflow event should have fired after updating transform");
SimpleTest.finish();
}
</script>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=981637">Mozilla Bug 981637</a>
<div id="bug981637" style="overflow: hidden; width: 100px; height: 100px;"><div style="transform: scale(0.8); width: 100px; height: 100px"></div></div>
<pre id="test">
</pre>
</body>
</html>
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