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<!DOCTYPE html>
<meta name="viewport" content="width=device-width,initial-scale=1">
<link rel="help" href="https://www.w3.org/TR/intersection-observer/#dom-intersectionobserver-scrollmargin">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/intersection-observer-test-utils.js"></script>
<iframe
id="target-iframe"
src="resources/iframe-no-root-subframe.html"
width="300"
height="200"
></iframe>
<script>
var iframe = document.getElementById("target-iframe");
var target;
var entries = [];
iframe.onload = function() {
runTestCycle(function() {
assert_true(!!iframe, "iframe exists");
target = iframe.contentDocument.getElementById("target");
assert_true(!!target, "Target element exists.");
var observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes)
}, {
scrollMargin: "18px"
});
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, "No initial notifications.");
runTestCycle(testIntersection, "Test scroll margin intersection");
}, "Observer with the implicit root; target in a same-origin iframe.");
};
function testIntersection() {
assert_equals(entries.length, 1, "IntersectionObserverEntryCount");
assert_true(entries[0].isIntersecting, "isIntersecting");
assert_approx_equals(entries[0].intersectionRatio, 0.1, 0.001, "intersectionRatio");
}
</script>
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