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<!DOCTYPE html>
<title>Sticky positioned element should be observable by offsetTop and offsetLeft</title>
<link rel="help" href="https://www.w3.org/TR/css-position-3/#sticky-pos" />
<meta name="assert" content="This test checks that a sticky positioned element
should be observable by offsetTop/offsetLeft." />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
margin: 0;
}
.container {
position: relative; /* Required for offsetTop/offsetLeft tests. */
overflow: scroll;
width: 200px;
height: 200px;
}
.spacer {
width: 2000px;
height: 2000px;
}
.box {
width: 100px;
height: 100px;
background-color: green;
}
.sticky {
position: sticky;
top: 50px;
left: 20px;
}
</style>
<div id="scroller1" class="container">
<div class="spacer"></div>
</div>
<script>
test(() => {
var scroller = document.getElementById('scroller1');
scroller.scrollTop = 100;
scroller.scrollLeft = 75;
var sticky = document.createElement('div');
sticky.className = 'sticky box';
scroller.insertBefore(sticky, scroller.querySelector('.spacer'));
assert_equals(sticky.offsetTop, scroller.scrollTop + 50);
assert_equals(sticky.offsetLeft, scroller.scrollLeft + 20);
}, 'offsetTop/offsetLeft should be correct for sticky after script insertion');
</script>
<div id="scroller2" class="container">
<div id="sticky2" class="sticky box"></div>
<div class="spacer"></div>
</div>
<script>
test(function() {
var scroller = document.getElementById('scroller2');
var sticky = document.getElementById('sticky2');
scroller.scrollTop = 100;
scroller.scrollLeft = 75;
var div = document.createElement('div');
div.style.height = '65px';
scroller.insertBefore(div, sticky);
assert_equals(sticky.offsetTop, scroller.scrollTop + 50);
assert_equals(sticky.offsetLeft, scroller.scrollLeft + 20);
}, 'offsetTop/offsetLeft should be correct for sticky after script-caused layout');
</script>
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