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<!DOCTYPE html>
<title>
Adding a new snap area while already snapped should not make the scroller snap to it.
</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#re-snap" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
div {
position: absolute;
margin: 0;
}
#scroller {
height: 500px;
width: 500px;
overflow: hidden;
scroll-snap-type: both mandatory;
}
#initial-target {
width: 300px;
height: 300px;
top: 100px;
left: 100px;
background-color: green;
scroll-snap-align: start;
}
#other-target {
width: 300px;
height: 300px;
top: 300px;
left: 300px;
background-color: red;
scroll-snap-align: start;
}
.area {
width: 2000px;
height: 2000px;
}
</style>
<div id="scroller">
<div class="area"></div>
<div id="initial-target"></div>
<div id="other-target"></div>
</div>
<script>
const initial_target = document.getElementById("initial-target");
const other_target = document.getElementById("other-target");
const scroller = document.getElementById("scroller");
test(() => {
scroller.removeChild(other_target);
scroller.scrollTo(0,0);
assert_equals(scroller.scrollTop, 100);
assert_equals(scroller.scrollLeft, 100);
scroller.appendChild(other_target);
assert_equals(scroller.scrollTop, 100);
assert_equals(scroller.scrollLeft, 100);
}, "Adding a new snap area while already snapped should not make the scroller snap to it.");
</script>
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