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<!DOCTYPE html>
<html dir="rtl">
<head>
<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: 120px;
left: 0;
}
#root {
width: 350px;
height: 100px;
border: 1px solid black;
display: flex;
flex-direction: row;
overflow-x: auto;
}
#target-start, #target-end {
width: 100px;
height: 100px;
flex-shrink: 0;
background-color: green;
text-align: center;
}
#target-end {
margin-inline-start: 500px;
}
</style>
</head>
<div id="root">
<div id="target-start">start</div>
<div id="target-end">end</div>
</div>
<script>
runTestCycle(function() {
let io = new IntersectionObserver(entries => {
entries.forEach(entry => {
if (entry.isIntersecting) {
entry.target.classList.add("intersecting");
} else {
entry.target.classList.remove("intersecting");
}
});
}, { root: document.getElementById("root") });
document.querySelectorAll("#root > div").forEach(element => {
io.observe(element);
});
runTestCycle(step0, "First rAF");
}, "Explicit rtl root with overflow clipping");
function step0() {
assert_true(
document.getElementById("target-start").classList.contains("intersecting"),
"Target at scroll start is intersecting");
assert_false(
document.getElementById("target-end").classList.contains("intersecting"),
"Target at scroll end is not intersecting");
}
</script>
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