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<meta name="viewport" content="width=device-width; initial-scale=1.0">
<title>Inactive iframe with overscroll-behavior</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>
<iframe id="scroll" srcdoc="<!doctype html><html style='overscroll-behavior:none; overflow: auto;'><div style='width:100px;height:2000px;'>">
<div style="height: 5000px;"></div><!-- So the page is scrollable as well -->
<script type="application/javascript">
async function test() {
var iframe = document.getElementById("scroll");
var iframeWindow = iframe.contentWindow;
// scroll the iframe to the bottom, such that a subsequent scroll on it
// _would_ hand off to the page if overscroll-behavior allowed it
iframeWindow.scrollTo(0, iframeWindow.scrollMaxY);
await promiseApzFlushedRepaints();
is(iframeWindow.scrollY, iframeWindow.scrollMaxY, "iframe has scrolled to the bottom");
// Scroll over the iframe, and make sure that the page
// does not scroll.
// We can't wait for a "scroll" event unconditionally, since if the platform
// behaviour we are testing is correct (overscroll-behavior is respected),
// one will never arrive.
var waitForScroll = false;
await promiseMoveMouseAndScrollWheelOver(iframeWindow, 100, 100, waitForScroll);
// However, we need to give a potential "scroll" event a chance to be dispatched,
// so that if the platform behaviour we are testing is incorrect (overscroll-behavior)
// is not respected, we catch it.
await promiseApzFlushedRepaints();
is(window.scrollY, 0, "overscroll-behavior was respected");
.then(subtestDone, subtestFailed);
#scroll {
width: 200px;
height: 500px;