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<!doctype html>
<title>CSSOM View - scrollIntoView aligns scrollport-covering child in both inline and block directions.</title>
<meta charset="utf-8">
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1497677">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#scroller {
width: 200px;
height: 200px;
background-color: purple;
overflow: hidden;
position: relative;
}
#child {
width: 400px;
height: 400px;
background-color: green;
position: absolute;
left: 0px;
top: 0px;
}
</style>
<div id="scroller">
<div id="space" style="height:400%; width: 400%"></div>
<div id="child"></div>
</div>
<script>
const scroller = document.getElementById("scroller");
const child = document.getElementById("child");
function test_alignment(alignment, start_offset, expected_offset) {
scroller.scrollTop = start_offset.top;
scroller.scrollLeft = start_offset.left;
child.scrollIntoView({block: alignment, inline: alignment});
assert_equals(scroller.scrollTop, expected_offset.top,
`${alignment} sets top`);
assert_equals(scroller.scrollLeft, expected_offset.left,
`${alignment} sets left`);
}
test(function() {
// child, being positioned at (0, 0) and having size 400 x 400 covers the
// scrollport at scroll offsets (0,0) and (100, 100).
test_alignment("start", {top: 100, left: 100}, {top: 0, left: 0});
test_alignment("center", {top: 0, left: 0}, {top: 100, left: 100});
test_alignment("end", {top: 100, left: 100}, {top: 200, left: 200});
}, "scrollIntoView scrolls scrollport-covering child in both axes");
</script>
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