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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./intersection-observer-test-utils.js"></script>
<style>
#root {
width: 200px;
height: 200px;
}
#scroller {
width: 160px;
height: 200px;
overflow-y: scroll;
}
#target {
width: 100px;
height: 100px;
background-color: green;
}
.spacer {
height: 300px;
}
</style>
<div id="root">
<div id="scroller">
<div class="spacer"></div>
<div id="target"></div>
<div class="spacer"></div>
</div>
</div>
<script>
setup({message_events: [], output_document: window.parent.document});
var entries = [];
var root, scroller, target;
runTestCycle(function() {
root = document.getElementById("root");
assert_true(!!root, "Root element exists.");
scroller = document.getElementById("scroller");
assert_true(!!scroller, "Scroller element exists.");
target = document.getElementById("target");
assert_true(!!target, "Target element exists.");
var observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes)
}, {root: root});
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, "No initial notifications.")
runTestCycle(step1, "First rAF.");
}, "IntersectionObserver in iframe with explicit root.");
function step1() {
scroller.scrollTop = 250;
runTestCycle(step2, "scroller.scrollTop = 250");
checkLastEntry(entries, 0, [8, 108, 308, 408, 0, 0, 0, 0, 8, 208, 8, 208, false]);
}
function step2() {
checkLastEntry(entries, 1, [8, 108, 58, 158, 8, 108, 58, 158, 8, 208, 8, 208, true]);
}
</script>
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