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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/intersection-observer-test-utils.js"></script>
<style>
body, html {
margin: 0;
}
pre, #log {
position: absolute;
top: 0;
left: 200px;
}
.testdiv {
font-size: 24px;
}
</style>
<div class="testdiv">This is the <span id="target">target</span>.</div>
<div class="testdiv" id="occluder">This is the occluder.</div>
<script>
var delay = 100;
var entries = [];
var target;
var occluder;
runTestCycle(function() {
target = document.getElementById("target");
occluder = document.getElementById("occluder");
assert_true(!!target, "target exists");
assert_true(!!occluder, "occluder exists");
var observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes)
}, {trackVisibility: true, delay: delay});
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, "No initial notifications.");
runTestCycle(step0, "First rAF.", delay);
}, "IntersectionObserverV2 in a single document using the implicit root, with an occluding element.", delay);
function step0() {
occluder.style.marginTop = "-10px";
runTestCycle(step1, "occluder.style.marginTop = '-10px'", delay);
assert_equals(entries.length, 1);
assert_true(entries[0].isVisible);
}
function step1() {
// Occluding elements with opacity=0 should not affect target visibility.
occluder.style.opacity = "0";
runTestCycle(step2, "occluder.style.opacity = 0", delay);
assert_equals(entries.length, 2);
assert_false(entries[1].isVisible);
}
function step2() {
assert_equals(entries.length, 3);
assert_true(entries[2].isVisible);
}
</script>
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