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Test Info: Warnings

<!DOCTYPE html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/intersection-observer-test-utils.js"></script>
#scroller { width: 100px; height: 100px; overflow: hidden; background-color: gray; position: absolute; }
#target { width: 50px; height: 50px; background-color: green; }
<div id=root>
<div id=scroller>
<div id=target></div>
let entries = [];
window.onload = function() {
runTestCycle(testIntersection, "Test scroll margin intersection");
const observer = new IntersectionObserver(
es => entries = entries.concat(es),
root: document.querySelector("#root"),
scrollMargin: "10px"
function testIntersection() {
assert_equals(entries.length, 1, "IntersectionObserverEntryCount");
// Not insecting because root is not in the containing block chain of target.
assert_false(entries[0].isIntersecting, "isIntersecting");