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[css-scroll-snap-2] Add shadow DOM test for scroll-initial-target #50101

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Jan 15, 2025
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[css-scroll-snap-2] Add shadow DOM test for scroll-initial-target #50101

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136 changes: 136 additions & 0 deletions css/css-scroll-snap-2/scroll-initial-target/scroll-initial-target-shadow-dom.tentative.html
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<!DOCTYPE html>
<html>
<head>
<title> CSS Scroll Snap 2 Test: scroll-initial-target for scroller in shadow DOM</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-initial-target">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<style>
.space {
width: 50px;
height: 500px;
}
.scroller {
width: 100px;
height: 100px;
overflow: scroll;
border: solid 2px;
}
.purpleborder {
border: solid 2px purple;
}
.target {
scroll-initial-target: nearest;
width: 50px;
height: 50px;
background-color: green
}
#wrapper {
/* Hide everything initially to ensure that the test sees the scroll */
/* events from the scrolls to the scroll-initial-targets. */
display: none;
}
</style>
<div id="wrapper">
<div id="scroller_before" class="scroller">
<div class="space"></div>
<div class="target"></div>
</div>
<div id="shadowDomHost">
<template shadowrootmode="open">
<style>
.space {
width: 50px;
height: 500px;
}
.scroller {
width: 100px;
height: 100px;
overflow: scroll;
border: solid 2px red;
}
.target {
scroll-initial-target: nearest;
width: 50px;
height: 50px;
background-color: green
}
</style>
<slot name="slot1"></slot>
<div id="shadow_scroller" class="scroller">
<div id="space" class="space"></div>
<div id="target" class="target"></div>
</div>
<slot name="slot2"></slot>
</template>
<div id="slot1scroller" slot="slot1" class="purpleborder scroller">
<div id="space" class="space"></div>
<div class="target"></div>
</div>
<div id="slot2scroller" slot="slot2" class="purpleborder scroller">
<div id="space" class="space"></div>
<div class="target"></div>
</div>
</div>
<div id="scroller_after" class="scroller">
<div class="space"></div>
<div class="target"></div>
</div>
</div>
<script>
const scroller_before = document.getElementById("scroller_before");
const slot1scroller = document.getElementById("slot1scroller");
const shadow_scroller =
shadowDomHost.shadowRoot.querySelector(".scroller");
const slot2scroller = document.getElementById("slot2scroller");
const scroller_after = document.getElementById("scroller_after");

const scrollers = [scroller_before, slot1scroller, shadow_scroller,
slot2scroller, scroller_after];
const scroll_log = [];

function setUpLogging() {
let promises = [];
for (const scroller of scrollers) {
promises.push(new Promise((resolve) => {
scroller.addEventListener("scroll", () => {
scroll_log.push(scroller.id);
resolve();
}, { once: true });
}));
}
return Promise.all(promises);
}

function verifyScrollPositions() {
for (const scroller of scrollers) {
// Each scroller's target is at the scroller's very bottom so the
// scroller should be scrolled all the way down.
assert_equals(scroller.scrollTop,
scroller.scrollHeight - scroller.clientHeight,
`${scroller.id} is scrolled to its target`);
}
}

promise_test(async (t) => {
// Arm the promises that should be resolved due to scrolling to the
// scroll-initial-targets.
const scroll_promises = setUpLogging();

const wrapper = document.getElementById("wrapper");
wrapper.style.display = "initial";

await scroll_promises;

// Verify that the order in which the scroll containers were scrolled
// matches flat tree order.
assert_array_equals(scroll_log, ["scroller_before", "slot1scroller",
"shadow_scroller", "slot2scroller", "scroller_after"]);

verifyScrollPositions();
}, "scroll-initial-target in shadow DOM is scrolled to initially.");
</script>
</body>
</html>
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