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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;
}
#root {
width: 170px;
height: 200px;
overflow-y: scroll;
}
#target {
width: 100px;
height: 100px;
background-color: green;
position: absolute;
}
</style>
<div id="root" style="position: absolute">
<div id="target" style="left: 50px; top: 250px"></div>
</div>
<script>
var entries = [];
var root, target;
runTestCycle(function() {
root = document.getElementById("root");
assert_true(!!root, "root 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.");
target.style.top = "10px";
runTestCycle(test1, "In containing block and intersecting.");
}, "IntersectionObserver should only report intersections if root is a containing block ancestor of target.");
function test1() {
runTestCycle(test2, "In containing block and not intersecting.");
var rootBounds = contentBounds(root);
checkLastEntry(entries, 0, [58, 158, 18, 118, 58, 158, 18, 118].concat(rootBounds));
target.style.top = "250px";
}
function test2() {
runTestCycle(test3, "Not in containing block and intersecting.");
var rootBounds = contentBounds(root);
checkLastEntry(entries, 1, [58, 158, 258, 358, 0, 0, 0, 0].concat(rootBounds));
root.style.position = "static";
target.style.top = "10px";
}
function test3() {
runTestCycle(test4, "Not in containing block and not intersecting.");
checkLastEntry(entries, 1);
target.style.top = "250px";
}
function test4() {
checkLastEntry(entries, 1);
target.style.top = "0";
}
</script>
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