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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>
body {
margin: 0;
}
#root {
width: 200px;
height: 200px;
overflow: hidden;
border-left: 50px solid yellow;
writing-mode: vertical-rl;
}
#target {
width: 100px;
height: 100px;
background-color: green;
}
</style>
<div id="root">
<div id="target" style="width: 100px; height: 100px; transform: translateX(101px)"></div>
</div>
<script>
var entries = [];
runTestCycle(function() {
var root = document.getElementById('root');
var target = document.getElementById('target');
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.");
}, "IntersectionObserver vertical-rl root.");
function step0() {
runTestCycle(step1, "Set transform=translateX(50px) on target.");
checkLastEntry(entries, 0, [251, 351, 0, 100, 0, 0, 0, 0, 50, 250, 0, 200, false]);
target.style.transform = "translateX(50px)";
}
function step1() {
checkLastEntry(entries, 1, [200, 300, 0, 100, 200, 250, 0, 100, 50, 250, 0, 200, true]);
}
</script>
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