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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /dom/events/scrolling/scrollend-event-fires-on-visual-viewport.html - WPT Dashboard Interop Dashboard
<!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 = async () => {
async function pan_viewport_test(add_event_listener_func) {
const preScrollVisualViewportOffsetTop = visualViewport.offsetTop;
const preScrollWindowScrollOffset = window.scrollY;
const scrollend_promise = add_event_listener_func();
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.");
// No need to undo scroll; subsequent test has room to scroll further.
}
await waitForCompositorCommit();
await pinchZoomIn();
assert_greater_than(visualViewport.scale, 1, "page should be zoomed in.");
promise_test(async (t) => {
await pan_viewport_test(() => {
return new Promise((resolve) => {
visualViewport.addEventListener("scrollend", resolve, { once: true});
});
});
}, "scrollend listener added via addEventlistener fires when the visual " +
"viewport is panned.");
promise_test(async (t) => {
await pan_viewport_test((t) => {
return new Promise((resolve) => {
visualViewport.onscrollend = () => {
visualViewport.onscrollend = undefined;
resolve();
}
});
});
}, "visualviewport.onscrollend fires when the visual viewport is panned.");
promise_test(async (t) => {
const preScrollVisualViewportOffsetTop = visualViewport.offsetTop;
const preScrollWindowScrollOffset = window.scrollY;
let vv_scrollend_timestamp = null;
let window_scrollend_timestamp = null;
visualViewport.addEventListener("scrollend", (e) => {
vv_scrollend_timestamp = e.timeStamp;
}, { once: true});
let window_scrollend_promise = new Promise(resolve => {
window.addEventListener("scrollend", (e) => {
window_scrollend_timestamp = e.timeStamp;
resolve();
}, { once: true});
});
// A scroll that exceeds the visual viewport size should trigger a
// window scrollend and a visual viewport scrollend event.
const scrollAmount = 200;
await touchScrollInTarget(scrollAmount, document.documentElement, "down");
// Wait for the window scrollend promise, and the visual viewport
// scrollend should have been fired before the window scrollend
await window_scrollend_promise;
assert_less_than(vv_scrollend_timestamp, window_scrollend_timestamp,
"the visualViewport scrollend event is fired first");
}, "visualviewport.onscrollend and window scrollend order.");
}
</script>
</body>
</html>