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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>
<style>
pre, #log {
position: absolute;
top: 0;
left: 200px;
}
#target {
width: 0px;
height: 0px;
}
#container {
overflow: clip;
}
</style>
<div id="container">
<div id='target'></div>
</div>
<script>
var entries = [];
runTestCycle(function() {
var target = document.getElementById('target');
assert_true(!!target, "target exists");
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 should generate a notification.");
}, "Ensure that a zero-area target intersecting root generates a notification with intersectionRatio == 1");
function step0() {
assert_equals(entries.length, 1, "One notification.");
assert_equals(entries[0].intersectionRatio, 1, "intersectionRatio == 1");
}
</script>
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