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<!DOCTYPE html>
<title>
Updating the scroll-snap-type of a snap container should make it resnap accordingly.
</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: none;
}
#y-target {
width: 300px;
height: 300px;
top: 100px;
left: 0;
background-color: green;
scroll-snap-align: start none;
}
#x-target {
width: 300px;
height: 300px;
top: 0;
left: 100px;
background-color: red;
scroll-snap-align: none start;
}
.area {
width: 2000px;
height: 2000px;
}
</style>
<div id="scroller">
<div class="area"></div>
<div id="x-target"></div>
<div id="y-target"></div>
</div>
<script>
const x_target = document.getElementById("x_target");
const y_target = document.getElementById("y_target");
const scroller = document.getElementById("scroller");
function cleanup() {
scroller.style.setProperty("scroll-snap-type", "none");
}
test(t => {
t.add_cleanup(cleanup);
scroller.scrollTo(0,0);
assert_equals(scroller.scrollTop, 0);
assert_equals(scroller.scrollLeft, 0);
scroller.style.setProperty("scroll-snap-type", "y mandatory");
assert_equals(scroller.scrollTop, 100);
assert_equals(scroller.scrollLeft, 0);
}, "Changing the scroller's snap type to y should make it resnap on the y-axis.");
test(t => {
t.add_cleanup(cleanup);
scroller.scrollTo(0,0);
assert_equals(scroller.scrollTop, 0);
assert_equals(scroller.scrollLeft, 0);
scroller.style.setProperty("scroll-snap-type", "x mandatory");
assert_equals(scroller.scrollLeft, 100);
assert_equals(scroller.scrollTop, 0);
}, "Changing the scroller's snap type to x should make it resnap on the x-axis.");
test(t => {
t.add_cleanup(cleanup);
scroller.scrollTo(0,0);
assert_equals(scroller.scrollTop, 0);
assert_equals(scroller.scrollLeft, 0);
scroller.style.setProperty("scroll-snap-type", "x mandatory");
assert_equals(scroller.scrollLeft, 100);
assert_equals(scroller.scrollTop, 0);
scroller.style.setProperty("scroll-snap-type", "y mandatory");
assert_equals(scroller.scrollTop, 100);
}, "Changing the scroller's snap type axis should make it resnap.");
</script>
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