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<!doctype html>
<meta charset="utf-8">
<title>Scroll position restore on shadow tree</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
scroll-box {
display: block;
width: 100px;
height: 100px;
margin: 10px;
border: 1px solid;
&::part(box) {
width: 100px;
height: 100px;
overflow: auto;
}
> .content {
height: 500px;
background-image: linear-gradient(blue, green);
}
}
#wrapper {
position: relative;
display: inline-block;
border: 1px solid;
&.change {
/* Changing display rebuilds the layout tree */
display: block;
position: absolute;
}
}
</style>
<!-- It's important that the shadow trees below are the same -->
<div id="wrapper">
<scroll-box>
<template shadowrootmode="open">
<div part="box"><slot></slot></div>
</template>
<div class="content"></div>
</scroll-box>
<scroll-box>
<template shadowrootmode="open">
<div part="box"><slot></slot></div>
</template>
<div class="content"></div>
</scroll-box>
</div>
<script>
promise_test(async function() {
let wrapper = document.getElementById("wrapper");
let [sb1, sb2] = wrapper.querySelectorAll("scroll-box");
sb1 = sb1.shadowRoot.querySelector("div[part=box]");
sb2 = sb2.shadowRoot.querySelector("div[part=box]");
sb1.scrollTop = 100;
sb2.scrollTop = 200;
assert_equals(sb1.scrollTop, 100, "scrollTop 1 is reasonable");
assert_equals(sb2.scrollTop, 200, "scrollTop 2 is reasonable");
wrapper.classList.add("change");
assert_equals(sb1.scrollTop, 100, "scrollTop 1 hasn't changed");
assert_equals(sb2.scrollTop, 200, "scrollTop 2 hasn't changed");
await new Promise(r => {
requestAnimationFrame(() => requestAnimationFrame(r));
});
// For good measure
assert_equals(sb1.scrollTop, 100, "scrollTop 1 hasn't changed after rAF");
assert_equals(sb2.scrollTop, 200, "scrollTop 2 hasn't changed after rAF");
});
</script>
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