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Test Info: Warnings

<!DOCTYPE html>
<title>IntersectionObserver when root == target doesn't compute an intersection</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
Quoting IntersectionObserver section 3.2.8, "Run the Update Intersection Observations Steps", step 2, substep 3:
If the intersection root is an Element, and target is not a descendant of
the intersection root in the containing block chain, skip to step 11.
#container {
overflow: scroll;
width: 100px;
height: 100px;
<div id=container>
async_test(function(t) {
let container = document.getElementById("container");
let observer = new IntersectionObserver(t.step_func_done(function(entries) {
assert_equals(entries.length, 1);
assert_equals(entries[0].intersectionRatio, 0);
assert_equals(entries[0].isIntersecting, false);
}), { root: container });