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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: scroll-start-target*</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-start-target">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<style>
.spacer {
width: 1000px;
height: 1000px;
}
.scroller {
width: 300px;
height: 300px;
border: solid 1px black;
overflow: scroll;
margin: 0px;
position: absolute;
scroll-start: end end;
/* This should be overriden by scroll-start-target. */
}
.box {
position: absolute;
width: 200px;
height: 200px;
}
.top_left {
top: 0px;
left: 0px;
background-color: red;
}
.center {
top: 200px;
left: 200px;
background-color: purple;
scroll-start-target: auto auto;
}
.bottom_right {
top: 400px;
left: 400px;
background-color: yellow;
}
</style>
<div class="scroller" id="scroller">
<div class="spacer"></div>
<div class="top_left box" id="top_left_box"></div>
<div class="center box" id="centerbox"></div>
<div class="bottom_right box"></div>
</div>
<script>
test((t) => {
let scroller = document.getElementById("scroller");
let top_left_box = document.getElementById("top_left_box");
const expected_scroll_top = top_left_box.getBoundingClientRect().height;
const expected_scroll_left = top_left_box.getBoundingClientRect().width;
assert_approx_equals(scroller.scrollTop, expected_scroll_top, 1,
"scroll-start-target sets initial vertical scroll position");
assert_approx_equals(scroller.scrollLeft, expected_scroll_left, 1,
"scroll-start-target sets initial horizontal scroll position");
});
</script>
</body>
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