<!doctype html>
<title>CSSOM View - scrollIntoView from focus call shouldn't horizontally scroll a partially visible element</title>
<meta charset="utf-8">
<link rel="help" href="https://html.spec.whatwg.org/#dom-focus">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1036817">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1050868">
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<style>
#scroller {
width: 200px;
height: 200px;
padding-top: 200px;
padding-left: 200px;
background: purple;
overflow: hidden;
}
#child {
width: 400px;
height: 400px;
background: green;
}
</style>
<div id="scroller">
<div id="child" tabindex="0"></div>
</div>
<script>
test(function() {
let scroller = document.getElementById("scroller");
let child = document.getElementById("child");
scroller.scrollTop = 0;
scroller.scrollLeft = 0;
assert_equals(scroller.scrollTop, 0, "Precondition");
assert_equals(scroller.scrollLeft, 0, "Precondition");
assert_not_equals(scroller.scrollTopMax, 0, "Precondition")
assert_not_equals(scroller.scrollLeftMax, 0, "Precondition")
child.focus();
assert_equals(scroller.scrollTop, 200, "Should have scrolled in the vertical direction");
assert_equals(scroller.scrollLeft, 0, "Should not have scrolled in the horizontal direction");
}, "focus scrolls partially-visible child only in vertical axis");
</script>
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