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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, minimum-scale=1.0">
<title>Tests that zooming in and out doesn't change the scroll position on an overflow hidden document</title>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<style>
html,body {
overflow: hidden;
}
</style>
</head>
<body>
<div style="height: 20000px; background-color: green"></div>
<script>
const utils = SpecialPowers.getDOMWindowUtils(window);
async function test() {
is(await getResolution(), 1.0, "should not be zoomed (1)");
is(window.scrollX, 0, "shouldn't have scrolled (2)");
is(window.scrollY, 0, "shouldn't have scrolled (3)");
is(visualViewport.pageTop, 0, "shouldn't have scrolled (4)");
is(visualViewport.pageLeft, 0, "shouldn't have scrolled (5)");
// Force reconstruction of the root scroll frame to trigger bug 1665332.
document.documentElement.style.display = "flex";
document.documentElement.offsetLeft;
document.documentElement.style.display = "";
document.documentElement.offsetLeft;
is(await getResolution(), 1.0, "should not be zoomed (6)");
is(window.scrollX, 0, "shouldn't have scrolled (7)");
is(window.scrollY, 0, "shouldn't have scrolled (8)");
is(visualViewport.pageTop, 0, "shouldn't have scrolled (9)");
is(visualViewport.pageLeft, 0, "shouldn't have scrolled (10)");
// Zoom in
SpecialPowers.getDOMWindowUtils(window).setResolutionAndScaleTo(4.0);
await promiseApzFlushedRepaints();
is(await getResolution(), 4.0, "should be zoomed (11)");
is(window.scrollX, 0, "shouldn't have scrolled (12)");
is(window.scrollY, 0, "shouldn't have scrolled (13)");
is(visualViewport.pageTop, 0, "shouldn't have scrolled (14)");
is(visualViewport.pageLeft, 0, "shouldn't have scrolled (15)");
// Scroll so the visual viewport offset is non-zero
utils.scrollToVisual(20000, 20000, utils.UPDATE_TYPE_MAIN_THREAD,
utils.SCROLL_MODE_INSTANT);
await promiseApzFlushedRepaints();
is(await getResolution(), 4.0, "should be zoomed (16)");
is(window.scrollX, 0, "shouldn't have scrolled (17)");
is(window.scrollY, 0, "shouldn't have scrolled (18)");
isnot(visualViewport.pageTop, 0, "should have scrolled (19)");
isnot(visualViewport.pageLeft, 0, "should have scrolled (20)");
// Zoom back out
SpecialPowers.getDOMWindowUtils(window).setResolutionAndScaleTo(1.0);
await promiseApzFlushedRepaints();
is(await getResolution(), 1.0, "should not be zoomed (21)");
is(window.scrollX, 0, "shouldn't have scrolled (22)");
is(window.scrollY, 0, "shouldn't have scrolled (23)");
is(visualViewport.pageTop, 0, "shouldn't have scrolled (24)");
is(visualViewport.pageLeft, 0, "shouldn't have scrolled (25)");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
</body>
</html>
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