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<!DOCTYPE html>
<title>scrollIntoView should only adjust scrollers in the containing block chain</title>
<link rel="help" href="https://drafts.csswg.org/cssom-view/#dom-element-scrollintoview">
<style>
.scroller {
width: 300px;
height: 300px;
overflow: scroll;
}
.contents {
width: 200%;
height: 300%;
}
#inner.scroller {
position: absolute;
margin-top: 250px;
margin-left: 100px;
width: 400px
}
#reveal {
margin-top: 400px;
background-color: blue;
}
</style>
<div id="container">
<div id="outer" class="scroller">
<div class="contents">
This should not scroll
<div id="inner" class="inner scroller">
<div class="contents">
contents
<div id="reveal">
Reveal me
</div>
</div>
</div>
</div>
</div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
add_completion_callback(() => document.getElementById("container").remove());
test(t => {
var reveal = document.getElementById('reveal');
var outerScroller = document.getElementById('outer');
var innerScroller = document.getElementById('inner');
var initialOuterTop = outerScroller.scrollTop;
var initialInnerTop = innerScroller.scrollTop;
assert_equals(initialOuterTop, 0);
assert_equals(initialInnerTop, 0);
reveal.scrollIntoView({block: "start", inline: "start"});
assert_approx_equals(innerScroller.scrollTop, 418, 4);
assert_equals(outerScroller.scrollTop, 0);
}, "scrollIntoView should not scroll ancestor overflow:scroll elements that are not containing block ancestors");
</script>
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