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<title>Checking zoomToFocusedInput scrolls that focused input element is visible position</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>
<div style="height: 8000px;">ABC</div>
<input id="input1">
<!-- Leave additional room below the element so it can be scrolled to the center -->
<div style="height: 1000px;">ABC</div>
<script type="application/javascript">
async function test() {
is(0, window.scrollY, "scroll position starts at zero");
await waitToClearOutAnyPotentialScrolls(window);
isnot(0, window.scrollY, "scroll position isn't top");
window.scrollTo(0, 0);
await waitToClearOutAnyPotentialScrolls(window);
is(0, window.scrollY, "scroll position is top");
let utils = SpecialPowers.getDOMWindowUtils(window);
let transformEndPromise = promiseTransformEnd();
isnot(0, window.scrollY, "scroll position isn't top");
// Test for bug 1669588: check that the zoom animation did not get
// cancelled by a main thread scroll position update triggered by
// the ScrollContentIntoView() operation performed by zoomToFocusedInput().
await transformEndPromise;
await promiseApzFlushedRepaints();
// Check that the zoom animation performed additional scrolling
// beyond the ScrollContentIntoView(). The ScrollContentIntoView()
// just scrolls enough to bring `input1` into the viewport, while
// the zoom animation will scroll further to center it. To
// distinguish the two cases, check that we scrolled enough that
// the element's top is above the middle of the visual viewport.
let inputTop = input1.getBoundingClientRect().top;
inputTop -= window.visualViewport.offsetTop;
ok(inputTop < (window.visualViewport.height / 2),
"input was scrolled at least as far as the middle of the viewport");
waitUntilApzStable().then(test).then(subtestDone, subtestFailed);