gecko-dev/dom/base/test/test_window_orientation.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Test for window.orientation</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="orientationcommon.js"></script>
<div id="log"></div>
<script>
async_test(function(t) {
var originalOrientation = screen.orientation.type;
var alternateOrientation = originalOrientation == "portrait-primary" ?
"landscape-primary" : "portrait-primary";
var originalWindowOrientation = window.orientation;
window.onorientationchange = function() {
t.step(function() { assert_not_equals(window.orientation, originalWindowOrientation); });
var p2 = specialPowersUnlock();
p2.then(function() {
t.done();
}).catch(t.step_func(function(err) {
assert_unreached("Error unlocking orientation: " + err);
t.done();
}));
}
var p1 = specialPowersLock(alternateOrientation);
p1.catch(t.step_func(function(err) {
assert_unreached("Error locking orientation: " + err);
t.done();
}));
}, "Test window.orientation and orientationchange.");
</script>