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<!DOCTYPE html>
<html>
<head>
<title>APZ overscroll handoff for fixed elements in a subdoc</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>
<meta name="viewport" content="width=device-width"/>
<style>
iframe {
width: 400px;
height: 400px;
border: solid 2px black;
}
#rootcontent {
height: 200vh;
background: yellow;
}
</style>
</head>
<body>
<iframe id="subdoc" srcdoc="
<!DOCTYPE html>
<html>
<head>
<style>
#fixed {
position: fixed;
top: 0;
height: 100px;
width: 80%;
overflow: scroll;
}
#fixed-content {
background: red;
}
#rootcontent {
background: green;
}
.spacer {
height: 200vh;
width: 100%;
}
</style>
</head>
<body>
<div id='fixed'>
<div id='fixed-content' class='spacer'></div>
</div>
<div id='rootcontent' class='spacer'></div>
</body>
</html>
"></iframe>
<div id="rootcontent"></div>
</body>
<script>
async function test() {
// Scroll to the bottom of the fixed position element to ensure that the following
// scroll does trigger overscroll handoff to the subdoc root scrollable element.
subdoc.contentWindow.fixed.scrollTop = subdoc.contentWindow.fixed.scrollHeight;
// After scrolling to bottom tick the refresh driver.
await promiseFrame();
let firstTransformEnd = promiseTransformEnd();
info("start scroll #1");
// Async scroll the fixed element by 200 pixels using the mouse-wheel. This should
// handoff the overscroll to the subdoc's root scrollable element.
await promiseMoveMouseAndScrollWheelOver(subdoc.contentWindow.fixed, 50, 50, false, 200);
info("After scroll #1: fixed=" + subdoc.contentWindow.fixed.scrollTop +
" subdoc window=" + subdoc.contentWindow.scrollY + " window=" + window.scrollY);
info("wait scroll #1");
await firstTransformEnd;
// Do not attempt the second scroll if we did scroll the root document.
// A scroll in this case would likely cause the test to timeout. The assertions at the
// end of the test will catch this.
// If we triggered a scroll handoff to the _root_ document from the subframe, do not
// make another attempt at a second scroll. The test has already failed.
if (window.scrollY == 0) {
let secondTransformEnd = promiseTransformEnd();
info("start scroll #2");
await promiseMoveMouseAndScrollWheelOver(subdoc.contentWindow.fixed, 50, 50, false, 200);
info("After scroll #2: fixed=" + subdoc.contentWindow.fixed.scrollTop +
" subdoc window=" + subdoc.contentWindow.scrollY + " window=" + window.scrollY);
info("wait scroll #2");
await secondTransformEnd;
}
// Ensure that the main element has not scrolled and overscroll was handed off to
// the subdocument root scrollable element.
is(window.scrollY, 0, "The overscroll should not handoff to the root window");
isnot(subdoc.contentWindow.scrollY, 0,
"The overscroll should handoff to the subdocument's root scrollable element");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
</html>
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