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<meta charset="utf-8">
<meta name="viewport" content="width=device-width; initial-scale=1.0">
<title>Sanity touch-tapping test</title>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script type="application/javascript">
async function test() {
while (window.scrollY == 0) {
// the scrollframe is not yet marked as APZ-scrollable. Mark it so
// before continuing.
window.scrollTo(0, 1);
await promiseApzFlushedRepaints();
// This is a scroll by 20px that should use paint-skipping if possible.
// If paint-skipping is enabled, this should not trigger a paint, but go
// directly to the compositor using an empty transaction. We check for this
// by ensuring the document element did not get painted.
var utils = window.opener.SpecialPowers.getDOMWindowUtils(window);
var elem = document.documentElement;
var skipping = == "?true";
window.scrollTo(0, 20);
await promiseAllPaintsDone();
if (skipping) {
is(utils.checkAndClearPaintedState(elem), false, "Document element didn't get painted");
// After that's done, we click on the button to make sure the
// skipped-paint codepath still has working APZ event transformations.
let clickPromise = new Promise(resolve => {
document.addEventListener("click", resolve);
await synthesizeNativeTap(document.getElementById("b"), 5, 5, function() {
dump("Finished synthesizing tap, waiting for button to be clicked...\n");
let clickEvent = await clickPromise;
is(, document.getElementById("b"), "Clicked on button, yay! (at " + clickEvent.clientX + "," + clickEvent.clientY + ")");
.then(subtestDone, subtestFailed);
<body style="height: 5000px">
<div style="height: 50px">spacer</div>
<button id="b" style="width: 10px; height: 10px"></button>