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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=2100"/>
<title>Check that double tapping something tall that we are already zoomed to doesn't scroll (it zooms out)</title>
<script src="apz_test_native_event_utils.js"></script>
<script src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script>
function within(a, b, tolerance) {
return (Math.abs(a-b) < tolerance);
}
async function test() {
let useTouchpad = (location.search == "?touchpad");
let resolution = await getResolution();
let initial_resolution = resolution;
ok(resolution > 0,
"The initial_resolution is " + resolution + ", which is some sane value");
ok(window.scrollY == 0, "window not scrolled");
info("window.scrollY " + window.scrollY);
// Check that double-tapping once zooms in
await doubleTapOn(document.getElementById("target"), 10, 10, useTouchpad);
let prev_resolution = resolution;
resolution = await getResolution();
ok(resolution > prev_resolution, "The first double-tap has increased the resolution to " + resolution);
ok(window.scrollY == 0, "window not scrolled");
info("window.scrollY " + window.scrollY);
let x = document.getElementById("target").getBoundingClientRect().width/2;
let y = window.visualViewport.height - 20;
// Check that near the bottom doesn't scroll but zooms out
await doubleTapOn(document.getElementById("target"), x, y, useTouchpad);
prev_resolution = resolution;
resolution = await getResolution();
ok(resolution < prev_resolution, "The second double-tap has decreased the resolution to " + resolution);
// slight float inaccuracy, not sure why
ok(within(resolution, initial_resolution, 0.0002), "The second double-tap has restored the resolution to " + resolution);
ok(window.scrollY == 0, "window not scrolled");
info("window.scrollY " + window.scrollY);
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
</head>
<body>
<div id="target" style="background: grey; width: 50vw; height: 300vh;">
</body>
</html>
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