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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 {
overflow: visible;
height: 200px;
width: 160px;
border: 8px solid black;
}
#target {
margin: 10px;
width: 100px;
height: 100px;
padding: 10px;
background-color: green;
}
</style>
<div id="root">
<div id="target" style="transform: translateY(300px)"></div>
</div>
<script>
var entries = [];
var target;
runTestCycle(function() {
target = document.getElementById("target");
assert_true(!!target, "target exists");
var root = document.getElementById("root");
assert_true(!!root, "root 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(step0, "First rAF.");
}, "Test that the target's border bounding box is used to calculate intersection.");
function step0() {
var targetBounds = clientBounds(target);
target.style.transform = "translateY(195px)";
runTestCycle(step1, "target.style.transform = 'translateY(195px)'");
checkLastEntry(entries, 0, targetBounds.concat(0, 0, 0, 0, 8, 184, 8, 224, false));
}
function step1() {
var targetBounds = clientBounds(target);
target.style.transform = "translateY(300px)";
runTestCycle(step2, "target.style.transform = 'translateY(300px)'");
checkLastEntry(entries, 1, targetBounds.concat(26, 146, 221, 224, 8, 184, 8, 224, true));
}
function step2() {
var targetBounds = clientBounds(target);
target.style.transform = "";
target.style.zoom = "2";
runTestCycle(step3, "target.style.zoom = 2");
checkLastEntry(entries, 2, targetBounds.concat(0, 0, 0, 0, 8, 184, 8, 224, false));
}
function step3() {
var targetBounds = clientBounds(target);
var intersectionWidth = (
176 // root width including border
-8 // root left border
-20 // target left margin * target zoom
) / 2; // convert to target's zoom factor.
var intersectionHeight = (216 - 8 - 20) / 2;
var intersectionRect = [targetBounds[0], targetBounds[0] + intersectionWidth,
targetBounds[2], targetBounds[2] + intersectionHeight];
checkLastEntry(entries, 3, targetBounds.concat(intersectionRect).concat(8, 184, 8, 224, true));
}
</script>
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