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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/common.js"></script>
</head>
<body>
<style>
.iframe {
height: 1000px;
width: 1000px;
}
</style>
<script>
window.onload = async () => {
await waitForCompositorCommit();
async function test(target_number) {
return promise_test(async (t) => {
let finish = null;
const finished = new Promise((res) => { finish = res; });
var iframe = document.createElement("iframe");
iframe.classList.add("iframe");
iframe.onload = async () => {
let boxes =
iframe.contentDocument.getElementsByClassName("positioned");
const box = (i) => {
return boxes[i - 1];
}
let scroller = iframe.contentDocument.getElementById("outer");
// There are 5 aligned boxes in positioned-target-iframe.html.
assert_equals(boxes.length, 5);
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[],
/*aligned_elements_y=*/[box(1), box(2), box(3), box(4), box(5)],
/*axis=*/"y",
/*expected_target_x*/null,
/*expected_target_x*/box(target_number));
// Let scroller no longer be a scroll container.
scroller.style.overflow = "visible";
assert_equals(scroller.scrollTop, 0);
// Let scroller be a scroll container once again.
scroller.style.overflow = "scroll";
// Run the test again.
await runScrollSnapSelectionVerificationTest(t, scroller,
/*aligned_elements_x=*/[],
/*aligned_elements_y=*/[box(1), box(2), box(3), box(4), box(5)],
/*axis=*/"y",
/*expected_target_x*/null,
/*expected_target_x*/box(target_number));
finish();
};
iframe.src = `positioned-target-iframe.html#target${target_number}`;
document.body.appendChild(iframe);
await finished;
document.body.removeChild(iframe);
}, "");
}
await test(1);
await test(2);
await test(3);
await test(4);
await test(5);
}
</script>
</body>
</html>
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