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<!DOCTYPE HTML>
<html>
<head>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/visual-viewport/viewport_support.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<style>
.large {
height: 200vh;
width: 200vw;
border: solid 1px black;
}
</style>
<div class="large"></div>
<script>
window.onload = () => {
promise_test(async () => {
await waitForCompositorCommit();
await pinchZoomIn();
assert_greater_than(visualViewport.scale, 1, "page should be zoomed in.");
const preScrollVisualViewportOffsetTop = visualViewport.offsetTop;
const preScrollWindowScrollOffset = window.scrollY;
const scrollend_promise = new Promise((resolve) => {
visualViewport.addEventListener("scrollend", resolve);
});
const scrollAmount = 50;
await touchScrollInTarget(scrollAmount, document.documentElement, "up");
await scrollend_promise;
assert_less_than(visualViewport.offsetTop, preScrollVisualViewportOffsetTop,
`visualViewport should be scrolled.`);
assert_equals(window.scrollY, preScrollWindowScrollOffset,
"the window should not scroll.");
}, "scrollend fires when visual viewport is panned.");
}
</script>
</body>
</html>
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