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<!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>
<div style="position: fixed; top: 0; left: 0">
<div id="target" style="width: 100px; height: 100px"></div>
</div>
<div id="log" style="height: 2000px"></div>
<script>
var entries = [];
runTestCycle(function() {
var observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes)
});
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, 'No initial notifications.');
runTestCycle(step0, 'First rAF.');
}, 'Fixed-position intersection observer on scroll');
function step0() {
window.scrollTo(0, 1000);
runTestCycle(step1, 'scrollTo(0, 1000)');
checkLastEntry(entries, 0,
[0, 100, 0, 100, 0, 100, 0, 100, 0,
document.documentElement.clientWidth, 0, document.documentElement.clientHeight,
true]);
}
function step1() {
window.scrollTo(0, 0);
checkLastEntry(entries, 0,
[0, 100, 0, 100, 0, 100, 0, 100, 0,
document.documentElement.clientWidth, 0, document.documentElement.clientHeight,
true]);
}
</script>
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