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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=2100"/>
<title>Check that tall element wider than the viewport after zooming in doesn't scroll up</title>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script type="application/javascript">
async function test() {
let useTouchpad = (location.search == "?touchpad");
let resolution = await getResolution();
ok(resolution > 0,
"The initial_resolution is " + resolution + ", which is some sane value");
// instant scroll down so the rect is roughly halfway down
window.scrollTo({
top: window.innerHeight * 3.5,
left: 0,
behavior: 'auto'
});
await promiseApzFlushedRepaints();
let scrollPos = window.scrollY;
ok(scrollPos > window.innerHeight * 3.5 - 50, "window scrolled down");
info("window.scrollY " + window.scrollY);
info("window.innerHeight " + window.innerHeight);
info("document.documentElement.scrollHeight " + document.documentElement.scrollHeight);
let target = document.getElementById("target");
// Check that first double tap does not scroll up
info("sending first double tap");
await doubleTapOn(target, 15, 15, useTouchpad);
let prev_resolution = resolution;
resolution = await getResolution();
ok(resolution > prev_resolution, "After double-tap the resolution increased to " + resolution);
// These values were determined experimentally, have not investigated the
// reason for the difference between platforms or the large tolerance needed.
let tolerance = 2;
if (getPlatform() == "mac") {
tolerance = 24;
}
ok(window.scrollY > window.innerHeight * 3.5 - tolerance, "window is still scrolled down");
ok(Math.abs(window.scrollY - scrollPos) < tolerance, "window didnt scroll: " + Math.abs(window.scrollY - scrollPos));
info("window.scrollY " + window.scrollY);
// Check that second double tap does not scroll up
// Intentionally miss the target and hit the large spacer div, which
// should cause us to zoom out, but not scroll up (too much).
info("sending second double tap");
await doubleTapOn(target, -10, 15, useTouchpad);
prev_resolution = resolution;
resolution = await getResolution();
ok(resolution < prev_resolution, "After double-tap the resolution decreased to " + resolution);
// These values were determined experimentally, have not investigated the
// reason for the difference between platforms or the large tolerance needed.
let amountToExpectScrollUp = 0;
if (getPlatform() == "android") {
amountToExpectScrollUp = 767;
tolerance = 4.6;
}
scrollPos -= amountToExpectScrollUp;
ok(window.scrollY > window.innerHeight * 3.5 - tolerance - amountToExpectScrollUp, "window is still scrolled down");
ok(Math.abs(window.scrollY - scrollPos) < tolerance, "window didnt scroll: " + Math.abs(window.scrollY - scrollPos));
info("window.scrollY " + window.scrollY);
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
<style>
.spacer {
background-color: #eee;
height: 800vh;
width: 1600vw;
}
.rect {
position: absolute;
width: 30px;
height: 30px;
background-color: #aaa;
top: 400vh;
right: 0;
}
</style>
</head>
<body>
<div id="target" class="rect">
</div>
<div class="spacer">
</div>
</body>
</html>