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<!DOCTYPE html>
<title>IntersectionObserver ratio with fractional bounds</title>
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1278897">
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#container {
overflow: hidden;
width: 500px;
}
#target {
display: list-item;
padding: 16.1px;
background: rebeccapurple;
}
</style>
<div id="container">
<div id="list">
<span id="target"></span>
</div>
</div>
<script>
async_test(function(t) {
let target = document.getElementById("target");
let list = document.getElementById("list");
let observer = new IntersectionObserver(t.step_func_done(function(entries) {
assert_equals(entries.length, 1);
assert_equals(entries[0].intersectionRatio, 1);
assert_equals(entries[0].isIntersecting, true);
}), { root: list, threshold: 1 });
observer.observe(target);
});
</script>
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