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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: scroll-start interaction with anchor navigation</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-start">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/browsers/browsing-the-web/resources/helpers.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
</head>
<body>
<iframe id="frame" src="scroll-start-with-anchor-navigation-inner-frame.html" onload="runTest()"></iframe>
<script>
function runTest() {
promise_test(async (t) => {
let scroller = frame.contentDocument.scrollingElement;
// anchor_target is at the bottom of the frame so the frame should be
// fully scrolled down to bring it into view.
let anchor_target_scrolltop = scroller.scrollHeight - scroller.clientHeight;
let anchor_target_link = frame.contentDocument.getElementById("anchor_target_link");
// Expect scroll offset of 100px per scroll-start.
assert_equals(scroller.scrollTop, 100,
"scroll-start sets initial scroll offset");
// Scroll away from start position.
scroller.scrollTop = 200;
await waitForCompositorCommit();
assert_equals(scroller.scrollTop, 200,
"scroll-start sets initial scroll offset");
anchor_target_link.click();
await waitForHashchange(frame.contentWindow);
assert_equals(frame.contentWindow.location.hash, "#anchor_target",
"clicking anchor link navigates to target");
// Expect page to be fully scrolled as anchor_target is at the bottom of
// the document.
assert_equals(scroller.scrollTop, anchor_target_scrolltop,
"anchor navigation sets scroll offset");
frame.contentWindow.history.back();
await waitForHashchange(frame.contentWindow);
assert_equals(frame.contentWindow.location.hash, "");
scroller = frame.contentDocument.scrollingElement;
assert_equals(scroller.scrollTop, 200,
"scroller returns to previous scroll position, not " +
"scroll-start");
}, "scroll-start does not override anchor navigation.");
}
</script>
</body>
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