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<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1947223">
<style>
html {
width: 200vw;
height: 200vh;
}
.fixed {
position: fixed;
top: 0px;
left: -200px;
width: 100px;
height: 100px;
overflow: scroll;
}
#target {
width: 100px;
height: 100px;
}
</style>
<div class="fixed">
<div id="target"></div>
<div style="height: 200vh"></div>
</div>
<script>
promise_test(async t => {
assert_equals(window.scrollY, 0);
assert_equals(visualViewport.pageTop, 0);
// Scroll the root scroll container a bit.
const scrollPromise =
new Promise(resolve => window.addEventListener("scroll", resolve));
window.scrollTo(0, 10);
await scrollPromise;
assert_equals(window.scrollY, 10);
assert_equals(visualViewport.pageTop, 10);
window.addEventListener("scroll", () => {
assert_unreached("Any scroll event should not be observed");
});
// Now trigger a scrollIntoView call to an element inside a position:fixed element.
// NOTE: smooth scroll is a trigger of the firefox bug.
document.querySelector('#target').scrollIntoView({ behavior: "smooth" });
// Wait four rAFs to give a chance the scrollIntoView scrolls this document.
await new Promise(resolve => requestAnimationFrame(resolve));
await new Promise(resolve => requestAnimationFrame(resolve));
await new Promise(resolve => requestAnimationFrame(resolve));
await new Promise(resolve => requestAnimationFrame(resolve));
assert_equals(window.scrollY, 10);
assert_equals(visualViewport.pageTop, 10);
}, "Element.scrollIntoView doesn't scroll a position:fixed element outside of the layout viewport");
</script>
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