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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="apz_test_utils.js"></script>
<script src="apz_test_native_event_utils.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<style>
.spacer {
height: 200vh;
width: 100%;
background: green;
}
#target {
height: 5vh;
width: 100%;
background: red;
}
</style>
</head>
<body>
<div class="spacer"></div>
<button id="target"></button>
<div class="spacer"></div>
</body>
<script>
async function test() {
let scrollendPromise = promiseScrollend();
window.synthesizeKey("KEY_Tab");
await scrollendPromise;
let tabScrollPosition = document.scrollingElement.scrollTop;
target.scrollIntoView({block: "center", inline: "center"});
let scrollIntoViewPosition = document.scrollingElement.scrollTop;
// The scroll position after an explicit scrollIntoView call on the target
// with block and inline set to "center" should be within +/- 1 of the
// scroll position from the tab scroll.
ok(tabScrollPosition >= scrollIntoViewPosition - 1 &&
tabScrollPosition <= scrollIntoViewPosition + 1,
"target element should be centered by tab scroll");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
</html>
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