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<!doctype html>
<meta charset="utf-8">
<title>CSS Test: :target-before and :target-after on html anchor scroll markers</title>
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-target-group">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11600">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/css-transitions/support/helper.js"></script>
<style>
.scroller {
width: 600px;
height: 300px;
overflow: scroll;
}
.scroller div {
width: 600px;
height: 300px;
margin-bottom: 20px;
background: green;
}
.wrapper {
scroll-target-group: auto;
}
.wrapper a {
color: blue;
}
.wrapper a:target-current {
color: green;
}
.wrapper a:target-before {
color: red;
}
.wrapper a:target-after {
color: yellow;
}
</style>
<div class="scroller">
<div id="first"></div>
<div id="second"></div>
<div id="third"></div>
<div id="fourth"></div>
<div id="fifth"></div>
<div id="sixth"></div>
</div>
<div class="wrapper">
<a href="#first">First</a>
<a href="#second">Second</a>
<a href="#third">Third</a>
<a href="#fourth">Fourth</a>
<a href="#fifth">Fifth</a>
<a href="#sixth">Sixth</a>
</div>
<script>
function checkScrollMarkers(scrollMarkers, targetCurrentIndex) {
for (let i = 0; i < scrollMarkers.length; ++i) {
if (i < targetCurrentIndex) {
assert_equals(getComputedStyle(scrollMarkers[i]).color, "rgb(255, 0, 0)", "scroll marker before the :target-current one should be red as :target-before");
} else if (i === targetCurrentIndex) {
assert_equals(getComputedStyle(scrollMarkers[i]).color, "rgb(0, 128, 0)", "the :target-current scroll marker should be green");
} else {
assert_equals(getComputedStyle(scrollMarkers[i]).color, "rgb(255, 255, 0)", "scroll marker before the :target-current one should be yellow as :target-after");
}
}
}
const scroller = document.querySelector(".scroller");
const scrollTargets = scroller.querySelectorAll("div");
const wrapper = document.querySelector(".wrapper");
const scrollMarkers = wrapper.querySelectorAll("a");
for (let i = 0; i < scrollTargets.length; ++i) {
promise_test(async t => {
// Make i-th scroll marker :target-current.
scrollTargets[i].scrollIntoView();
await waitForAnimationFrames(2);
// Check the :target-before/:target-after relations on all scroll markers.
checkScrollMarkers(scrollMarkers, i);
}, i + "th scroll marker test");
}
</script>
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