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<!DOCTYPE html>
<meta charset="utf-8">
<title>scrollIntoView on a scroller does not scroll the targeted scroll container</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.scroller {
overflow: scroll;
position: relative;
border: 2px solid black;
}
#outer {
width: 300px;
height: 400px;
border-color: blue;
}
#inner {
height: 200px;
border-color: red;
background: lightgreen;
/* Scroll padding on the inner scroller makes the scroll into view
* position of content within non-zero. */
scroll-padding: 50px;
/* Scroll margin is the offset in the outer scroller to preserve. */
scroll-margin: 20px;
}
.spacer {
height: 1000px;
}
</style>
<div id="outer" class="scroller">
<div class="spacer"></div>
<div id="inner" class="scroller">
<div class="spacer"></div>
</div>
<div class="spacer"></div>
</div>
<script>
promise_test(async t => {
const outerScroller = document.getElementById('outer');
const innerScroller = document.getElementById('inner');
innerScroller.scrollTop = 200;
innerScroller.scrollIntoView();
assert_equals(innerScroller.offsetTop - outerScroller.scrollTop, 20, "Should scroll inner scroller to scroll margin offset.");
assert_equals(innerScroller.scrollTop, 200, "Inner scroller should not scroll when asked to scroll into view.");
}, "scrollIntoView on a scrolling container should scroll its outer scrollers into view but not scroll itself.");
</script>
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